AG | 10oz

This page contains our current information on 10oz class Engelhard silver production bars and Legacy Ingots. For many collectors and investors, the 10oz Engelhard bar represents the standard and preferred bullion choice. Engelhard 10oz bars are a comfortable size to handle and serve as an ideal store of value for investment and trade.

As with the smaller weight class Legacy Ingots, Engelhard 10oz ingot lineage witnessed many variations through early production years. These variations include placement of hallmark, weight and purity stamping as well as frequently erratic and crude serial stamping. Amazingly, these ingots were generally considered junk bars and frequently melted until just a decade ago, when collectors began to appreciate their inherent beauty and undeniable scarcity. Engelhard 10oz Legacy Ingots are now among the most sought after on the collector front.

The most well-recognized of the 10oz bars are the ‘P’ prefix 7th and 10th series poured bars, produced at the Plainville, Massachusetts plant in the late 1970’s. These examples were designated ‘P’ prefix to represent the Plainville, Massachusetts facility, while examples designated ‘C’ prefix represent the Cartaret, New Jersey facility. These bars, along with the later 11th series pressed bars, have been regarded as the benchmark of Engelhard investment grade bars. With total production of approximately 100,000 ingots combined for 7th and 10th series, and 200,000 +/- for 11th series, they were relatively common in their day. However, many have been melted over the years, further fueling the collector market’s high demand for these iconic bullion examples. The 12th series ‘P’ and ‘C’ struck commercial bars are also gaining enthusiasm in the collector world, as the availability of earlier series bars continues to quickly diminish.

EXAMPLE	HALLMARK	OBVERSE	REVERSE	COMMENTARY	SAMPLE SERIAL NUMBERS	ICR | ESTIMATED MINTAGE
	Italic Boxed Hallmark	[10 OZS] [Italic Boxed London Hallmark] [999]	Cast Finish	10oz portrait style ingot produced by Engelhard London.	N/A	<100
	Large ‘E’ Hallmark | MC Absent	[Globe Logo] [10 TROY OUNCES] [FINE SILVER] [999+] [Hallmark in Elongated Octagon] [Serial Number]	Hallmark in Elongated Octagon, repeated 4 full times. All Engelhard is appreciative to MP for providing the much needed definitives for this variety.	1st series standard commercial bar in P-Series variation, circa 1984.	P129417 P129952 P130087 P130516	<750 MINTAGE
	Large ‘E’ Hallmark | MC Absent	[Globe Logo] [10 TROY OUNCES] [FINE SILVER] [999+] [Hallmark in Elongated Octagon] [Serial Number]	Hallmark in Elongated Octagon, repeated 4 full times	1st series standard commercial bar in exceedingly rare ‘CTC’ serial prefix.	CTC001	<10 MINTAGE
	Large ‘E’ Hallmark | MC Absent	[Globe Logo] [10 TROY OUNCES] [FINE SILVER] [999+] [Hallmark in Elongated Octagon] [Serial Number]	Hallmark in Elongated Octagon, repeated 4 full times	1st series standard commercial bar in exceedingly rare ‘WC’ serial prefix.	WC001	<10 MINTAGE
	Large ‘E’ Hallmark | MC Absent	[Globe Logo] [10 TROY OUNCES] [FINE SILVER] [999+] [Hallmark in Elongated Octagon] [Serial Number]	Hallmark in Elongated Octagon, repeated 4 full times	2nd series standard commercial bar in C-Series and occasional D-Series variation, circa 1985. Similar to above w/ exception of larger ‘E’ Logo within globe and variation of ‘ENGELHARD’ logo, most noticeably in the ‘G’.	C319832 C383787 C404908 C474007 C609085 C673429 C774350 C746069 D618256	450,000 MINTAGE
	Maple Leaf Hallmark	[Scotiabank Company Logo] [Scotiabank] [FINE SILVER 999 in Rectangle] [10 OUNCES TROY]	[Maple Leaf Hallmark] [Assayers & Refiners] [Serial Number in Bull Logo Frosted Rectangle]	Canadian portrait bar in Scotiabank counterstamp variation, circa 1985. Additional information regarding the Scotiabank counterstamp may be found at this LINK.	001039 001127 001311 001515 001569 001628 001705 001905	<500 MINTAGE
	Maple Leaf Hallmark	[Maple Leaf Hallmark] [Assayers & Refiners] [10 TROY OUNCES] [FINE SILVER 999 in Square] [Serial Number in Bull Logo Frosted Rectangle]	Blank	Canadian portrait bar in standard Maple Leaf variety, circa 1985. Examples 330469, 330476 and 330532 includes a Borg Warner Chemical 1,000,000 SAFE HOURS Safety Award sticker on the reverse, pictured below. As such, it is very possible that at least some of these bars were produced for such purpose. There was a very limited and concise serial run of these ‘Blank Back’ bars. Our thanks to Damien M. for this information!	330114 330236 330371 330435 330509 330532 330551 330565	<500 MINTAGE
	Maple Leaf Hallmark	[Maple Leaf Hallmark] [Assayers & Refiners] [10 TROY OUNCES] [FINE SILVER 999 in Square] [Serial Number in Bull Logo Frosted Rectangle]	TD BANK Logo, repeated six full times	Canadian portrait bar in Toronto Dominion Bank counterstamp variation, circa 1985. Additional information regarding the Toronto Dominion counterstamp may be found at this LINK.	329106 329110 329388 329913 410194 411028 411029 411139	<1,000 MINTAGE
	‘E’ in Elongated Octagon	[Statue of Liberty] [LIBERTY]	[Statue of Liberty Torch Logo] [LIBERTY TRADE SILVER] [.999+ FINE SILVER] [TEN TROY OUNCES] [SERIAL NUMBER] [© 1986 MTB] [UNITED STATES OF AMERICA]	Specialty collector bar produced for Manfra, Tordella & Brookes, 1986 mintage. It is important to note that the Metal Arts Company [MA] produced the first 10oz bars for MTB, serial range 1 to 5,000. JM produced them in wide and narrow formats. All Engelhard estimates serial range 6,500 to 16,000 and there appears to be a 1,500 serial number gap between MA, JM and Engelhard production runs. Occasionally found with original assay certificate, which typically demands a higher valuation when present.  Some bars were included in a 1oz, 5oz & 10oz boxed commemorative set with estimated mintage of 1,000 total sets, pictured below.	16710 17696 18090 18326 19814 20336 21306 21808 24398 25139	<7,500 MINTAGE
	Eagle & Flag Hallmark	[Eagle & Flag Hallmark] [Engelhard Triangle Hallmark] [999+ Fine SILVER] [10 Troy Ounces] [Serial Number]	Engelhard Triangle Hallmark, repeated 9 full times	3rd series standard commercial bar in C-Series variation, 1987 mintage.	C106086 C111756 C798425 C822910 C895361 C982744	300,000 MINTAGE

EXAMPLE	HALLMARK	OBVERSE	REVERSE	COMMENTARY	SAMPLE SERIAL NUMBERS	ICR | ESTIMATED MINTAGE
	Top Hallmark	[Hallmark in Elongated Octagon] [10.000] [999] [Serial Number]	Cast Finish	1st series ingot. Crude casting finish, non ‘+’ variety. Ingot 00627 sold privately on February 20, 2017 for $3,250.00. Ingot 00618 sold via eBay auction on December 7, 2017 for $3,643.95.  Ingot 00686 sold on eBay on February 3, 2023 for $3,679.00.  Ingot 00640 sold via MinEx auction on June 23, 2024 for $4,540.00.	00618 00627 00640 00650 00656 00686 00695 00706	<50 MINTAGE
	Top Hallmark	[Hallmark in Elongated Octagon] [10.000] [999]	Cast Finish	2nd series in serial absent variation.  This variety demonstrates a ground obverse finish for proper weight calibration.	Serial Absent	<25 MINTAGE
	Top Hallmark	[Hallmark in Elongated Octagon] [10.000] [999+] [Serial Number]	Cast Finish	2nd series in 4-digit serial variation.	3084 3085 3088 3091	<50 MINTAGE
	Top Hallmark	[Hallmark in Elongated Octagon] [10.000] [999+] [Serial Number]	Cast Finish	2nd series in 5-digit serial variation. Observed in weight class and purity stamp placement variation, pictured. Ingot 01605 sold privately on March 15, 2017 for $2,300.00. Ingot 01443 sold via eBay auction on November 19, 2017 for $2,402.77.	01333 01443 01549 01579 01605 02162 02236 02882 02966	<250 MINTAGE
	Top Hallmark	[Hallmark in Elongated Octagon] [Serial Number] [10.000] [999+]	Cast Finish	2nd series in 5-digit serial and stamp placement variations.  Example 09974 is currently part of the All Engelhard collection and was acquired directly from the daughter of a former Engelhard executive who served on the board of directors at the New Jersey Engelhard facility. These bars were produced in very limited quantity of 12 examples and were provided as gifts for the board of directors.  Ingot 10030 sold privately in February, 2019 for $5,500.00 per Wade R.	09974 10030 10055 10059	12 MINTAGE
	Mid Hallmark	[10.000] [999+] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series transitional ingots, observed with different serial font and casting mould than standard 3rd series examples as shown below.	10041	<25 MINTAGE
	Mid Hallmark	[10.000] [999+] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series in 4-digit serial variation, occasionally seen with higher placement of weight class and purity stampings. Ingot 3530 sold privately on May 13, 2017 for $2,500.00.  Note the variation in serial number font for number ‘3’ as demonstrated on ingot 3534, below.	3498 3525 3530 3534 3536	<50 MINTAGE
	Mid Hallmark	[10.000] [999+] [Hallmark in Elongated Octagon]	Cast Finish	3rd series in unique serial absent variation.  One example sold via eBay auction on October 8, 2018 for $1,136.00.	N/A	<100 MINTAGE
	Mid Hallmark	[10.000] [999+] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series in 5-digit serial variation with partial X rotary dial error prefix and a flatline postfix. This ingot was likely a Prototype for the 5 digit serial run.  It is currently the only example known, and our collector friend sourced the bar in Philadelphia in 1980 from legendary ANA coin dealer Harry J. Forman.  The ingot weighs 302 grams and matches the mould size of the early 5 digit 3rd series ingots.	13399	<5 MINTAGE
	Mid Hallmark	[10.000] [999+] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series in 5-digit serial variation with leading zero format. These zero [0] prefix bars are believed to have been produced in 1971, or prior. Please note sample serial numbers listed in the right column do not represent the only known examples. We have record of considerably more surviving examples.	03832 03833 04653 05607 06475 07253 08536 09922	<500 MINTAGE
	Mid Hallmark	[10.000] [999+] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series in 5-digit serial variation, occasionally seen with smooth, reflective finish as observed on the 71297 ingot pictured. Many studied examples across serial number range demonstrate small variations of font die and casting shape. We believe the wider spacing on weight and purity stampings began around 75xxx. Despite the seemingly wide serial number range, we believe these 5-digit ingots were only produced randomly in small runs and are, in fact, quite rare.  The obverse of these examples measure approximately 67.56mm x 33.53mm.	10084 10227 10260 11901 13383 14623 15257 30663 38294 41033 57317 63167 63194 63716 71297 77678 85437 85661	<5,000 MINTAGE
	Mid Hallmark	[10.000] [999+] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series in 5-digit serial variation with very rare zero-prefix serial assignment.	013648 013720	<25 MINTAGE
	Left Hallmark	[Custom ‘UNITED’ Hallmark] [10.000] [999+] [Serial Number]	Cast Finish	3rd series in 5-digit serial, United Refining counterstamp variation. These ingots were produced with different placements of the United hallmark, this example demonstrates a left-side placement. Ingot 07777 sold privately on January 9, 2017 for $3,300.00, and again via MineralExchange auction on 4/23/23 for $3,960.00 including Buyer fee. Ingot 07731 sold via eBay auction on October 21, 2017 for $2,837.00. Additional information may be found at this LINK.	07701 07710 07731 07765 07771 07777 07778 07820	<100 MINTAGE
	Right Hallmark	[10.000] [999+] [Custom ‘UNITED’ Hallmark] [Serial Number]	Cast Finish	3rd series in 5-digit serial, United Refining counterstamp variation. These ingots were produced with different placements of the United hallmark, this example demonstrates a right-side placement. Additional information may be found at this LINK.	07792	<50 MINTAGE
	Mid Hallmark	[10.000] [999+] [Custom ‘UNITED’ Hallmark] [Serial Number]	Cast Finish	3rd series in 5-digit serial, United Refining counterstamp variation. These ingots were produced with different placements of the United hallmark, this example demonstrates a center placement. Additional information may be found at this LINK.	07806	<10 MINTAGE
	Mid Hallmark	[10.000] [999+] [Custom ‘UNITED’ Hallmark] [Serial Number]	Cast Finish	3rd series in 5-digit serial, United Refining counterstamp variation. These ingots were produced with different placements of the United hallmark, this example demonstrates a mid-ingot placement. Ingot 15407 sold privately on March 15, 2017 for $3,350.00. Additional information may be found at this LINK.	15407 15420 15428	<50 MINTAGE
	Mid Hallmark	[Custom ‘MMS’ Hallmark] [10.000] [999+]	[MICHAEL BERGER]	3rd series in serial absent, MMS counterstamp variation.	Serial Absent	<10 MINTAGE
	Top Left Hallmark	[ACLI INTERNATIONAL]	[Serial Number] [10.000] [999+]	3rd series in 5-digit serial, ACLI International counterstamp variation. These ingots are a unique counterstamp variation as the serial number, weight class and purity stampings were placed on the reverse of the bar. Additional information may be found at this LINK.	10057 10094 10098 10107 10040 10110 10123	<60 MINTAGE
	Top Left Hallmark	[MMI] [999 + Fine] [Serial Number]	Cast Finish	3rd series in 5-digit serial, Monetary Metals International [MMI] variation. All Engelhard has authenticated one of these examples in hand through ingot micrometer measurements and full font study. Also produced in 3oz and 25oz weight class. Interestingly, these pieces were produced for clients and demonstrate highly polished sides and reverse with custom engraving. The polishing process resulted in slight altercation of weight class on this example. Originally a 10oz weight class, ingot 10146 weighs 297.34g, or 9.56oz. Additional information regarding Monetary Metals International counterstamp may be found at this LINK.	10098 10146 10165	<25 MINTAGE
	Top Left Hallmark	[LDACI COMMODITIES]	[Serial Number] [10.000] [999+]	3rd series in 5-digit serial, LDACI Commodities counterstamp variation. These ingots are a unique counterstamp variation as the serial number, weight class and purity stampings were placed on the reverse of the bar.	10562 10600	<25 MINTAGE
	Mid Hallmark	[10.000] [999+] [Hallmark in Elongated Octagon] [Custom ‘FPM’ Counterstamp] [Serial Number]	Cast Finish	3rd series in 5-digit serial, FPM [Fleet Precious Metals] counterstamp variation. Additional information may be found at this LINK.	10078	<100 MINTAGE
	Mid Hallmark	[10.000] [999+] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series in 6-digit serial variation with a number ‘8’ leading prefix. This variety demonstrates a ‘^’ over-stamp to the left of serial number. The serial number errors on these pieces resulted from part of the letter ‘X’ that was used as a filler for the lead position on the rotary stamp. This leading filler ‘X’ slipped out of position just enough to leave an impression of the bottom or top half of the letter. Also note the strength of the impression left by leading number ‘8’ due to its lack of use. We have registry entries noted for these error pieces in very tight ranges between 811855 to ‘8’14487 to include the unique ‘Y’ prefix variety such as ‘Y’12590 and believe that this range was shared with the 100oz examples with zero prefix. We estimate partial ‘X’ ‘8’ error stamp variety mintage at <250. Ingot 811864 sold privately on February 20, 2017 for $1,200.00 and again on MinEx auction on 6/18/23 for $1,567.50. Ingot 811882 sold on MinEx auction on 2/19/23 for $2719.20 final sale price.  Tulasi LoPriore’s example 13436, presented below, demonstrates the lack of serial prefix digit ‘8’ and includes the unique double ‘X’ impression.  Additionally, ingot 10473 demonstrates the same obverse double ‘X’ impression, but also includes 5th series 5oz ingot stampings on the reverse as presented below.	‘^8’11855 ‘^8’11858 ‘^8’11864 ‘^8’11868 ‘8’14487	<50 MINTAGE
	Mid Hallmark	[10.000] [999+] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series in 7-digit serial variation with a letter ‘X’ and number ‘8’ leading prefix. The serial number error on this piece resulted from the letter ‘X’ that was used as a filler for the lead position on the rotary stamp as well as the slipping of the number ‘8’ lead.  Three known examples, ‘X8’11882 illustrated, showing a full and perfectly struck error ‘X’ and ‘8’ serial prefix.	‘X8’11873 ‘X8’11882 ‘X8’11888	<5 MINTAGE [Included in <50 mintage estimate, above]
	Mid Hallmark	[10.000] [999+] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series in 6-digit serial variation with a letter ‘Y’ leading prefix. The serial number error on this piece resulted from the letter ‘Y’ that was used as a filler for the lead position on the rotary stamp. One example, illustrated, that includes a full and perfectly struck error ‘Y’ serial prefix.	‘Y’ 12590	<5 MINTAGE [Included in <50 mintage estimate, above]
	Mid Hallmark	[10.000] [999+] [Hallmark in Elongated Octagon] [Serial Number] [MFR Designation]	Cast Finish	3rd series in 5-digit serial variation with ‘MFR’ [Metals Fabrication & Refining] designation. Analysis indicates these were produced in six specific serial runs of 36xxx, 48xxx, 55xxx, 59xxx, 65xxx, 74xxx and have estimated mintage of less than 50 total examples on each run. It is important to note that ‘MFR’ is not a serial number suffix as some collectors may claim. The 100oz class examples confirm this as their serial number and ‘MFR’ designation are stamped on opposed corners of the ingot. Ingot 48283 ‘MFR’ sold via eBay auction for $1481.99 on July 6, 2021.	36174 ‘MFR” 36405 ‘MFR’ 48276 ‘MFR’ 48283 ‘MFR’ 55783 ‘MFR’ 55841 ‘MFR’ 59181 ‘MFR’ 59192 ‘MFR’ 65191 ‘MFR’ 65244 ‘MFR’ 74254 ‘MFR’ 74255 ‘MFR’ 74264 ‘MFR’	<250 MINTAGE
	Mid Hallmark	[10.000] [999+] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series in 5-digit variation, similar to our examples above except weight class and purity stampings are spaced further apart. We speculate, at this time, that serial numbers included only 77, 78, 79, 80, 85 and 86 prefix.	77848 77853 78090 79764 80326 80631 80653 85437 86828 86860 86876 86924	<1,000 MINTAGE
	Mid Hallmark	[999+] [10.000] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series in 5-digit serial variation, similar to our example above except weight class and purity stampings are reversed. Possibly an early Canadian variation.  Ingot 79197 sold via eBay auction for $900.00 on June 10, 2020.	78945 79104 79197 79226 79485 79566 79567 79568 79624	<500 MINTAGE
	Mid Hallmark	[10.ooo] [999+] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	4th series in 5-digit serial variation. Only variety with smaller trailing zeros in weight stamp, transitional piece in eliminating trailing zeros altogether, last example without T.OZ or TR. OZ. suffix. Ingot 16426 sold via eBay auction for $810.00 on September 20, 2017.	14431 15448 15480 16295 16426 16494 16553	<1,000 MINTAGE
	Mid Hallmark	[10.ooo] [999+] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	4th series in 6-digit serial variation. Same as our example above, except in 6-digit serial with zero prefix. Only variety with smaller trailing zeros in weight stamp, transitional piece in eliminating trailing zeros altogether, last example without T.OZ or TR. OZ. suffix.	015530 015602 015612 015771 015863 015887	<250 MINTAGE [Included in <1,000 mintage estimate, above]
	Mid Hallmark	[10 T.OZ] [Hallmark in Elongated Octagon] [999+ FINE SILVER] [Serial Number]	Cast Finish	5th series in very unique 7-digit serial number variation. Some examples have blanks where leading zeros would go [I.E. the faint outline of the rectangle of a blank where a number would otherwise be]. One sold in April, 2013 for about 5x melt value. Believed to be prototype piece or limited run for private collectors. This piece was first to eliminate trailing weight stamp zeros and first to detail ‘Troy Ounces’ suffix. Additional details may be found at this LINK.	0000043 0000058 0000059 0000062 0000075 0000076 0000077 0000125	<50 MINTAGE
	Mid Hallmark	[10 T.OZ] [Hallmark in Elongated Octagon] [999+ FINE SILVER]	Cast Finish	5th series in exceptionally unique serial number absent variation.  This example weights within proper tolerances for a non-altered Engelhard production piece.	N/A	<5 MINTAGE
	Mid Hallmark	[10 T.OZ] [Hallmark in Elongated Octagon] [999+ FINE SILVER] [Serial Number]	Cast Finish	5th series in standard production 5-digit serial variation. Similar to our example above, ingot demonstrates a more unified casting shape with a brushed obverse finish. We believe serial number range for this series is 16575 to 20999 with sporadic number assignment shared amongst 5oz and 100oz class, without duplications.	16597 17284 17366 17446 18000 18737 19038 19368 19900 20164 20737	<2,500 MINTAGE
	Mid Hallmark	[10 T.OZ] [Hallmark in Elongated Octagon] [999+ FINE SILVER] [Serial Number]	[Serial Number]	5th series in standard production 5-digit serial variation. Similar to our example above, though includes ‘018708’ serial number stamping with leading zero on the reverse.	18708	<5 MINTAGE
	Mid Hallmark	[10 T.OZ] [Hallmark in Elongated Octagon] [999+ FINE SILVER] [Serial Number]	[Serial Number]	5th series in standard production 5-digit serial variation. Similar to our example above, though includes reverse 57870 serial number stamping on back.  To date we have now verified over 50 examples showing this reverse stamp error, between the serial range of 18286 and 19612.	18216 18337 18469 18733 18745 18902 19090 19223 19364 19456 19612	<500 Mintage
	Mid Hallmark	[10 T.OZ] [Hallmark in Elongated Octagon] [999+ FINE SILVER] [Serial Number]	Cast Finish	5th series in standard production 5-digit serial variation. Similar to our example above, though demonstrates a ‘0’ serial prefix.	017406 020492	<25 MINTAGE
	Mid Hallmark	[10 T.OZ] [Hallmark in Elongated Octagon] [999+ FINE SILVER] [Serial Number]	Cast Finish	5th series in standard production 5-digit serial variation.  Similar to our example above, ingot demonstrates a double stamp error.  Ingot 16708 sold via eBay auction for $813.95 on November 26, 2017.	16708 20465	<10 MINTAGE
	Mid Hallmark	[10 T.OZ] [Hallmark in Elongated Octagon] [999+ FINE SILVER] [Serial Number]	Cast Finish	5th series in standard production 5-digit serial variation.  Similar to our example above, ingot 20465 pictured below demonstrates a serial number overstamping.	20465	<10 MINTAGE
	Mid Hallmark	[10 T.OZ] [Hallmark in Elongated Octagon] [999+ FINE SILVER] [Serial Number]	Cast Finish	5th series in standard production 5-digit serial variation.  Similar to our example above, ingot 20430 pictured below demonstrates a reverse impression of FINE SILVER under the serial number stamp.  This production error occurred due to a mould tray imprint that carried into the ingot pour.  One known example.	20430	<5
	Mid Hallmark	[10 T.OZ] [Hallmark in Elongated Octagon] [999+ FINE SILVER] [Serial Number]	Cast Finish	5th series in standard production 5-digit serial variation with ‘M’ serial prefix anomaly.	M 19559	1 MINTAGE
	Mid Hallmark	[10 T.OZ] [Hallmark in Elongated Octagon] [999+ FINE SILVER] [Serial Number]	Cast Finish	5th series in standard production 5-digit serial variation with ‘+’ serial number stamp application error. One example sold eBay auction for $1,500.00 on November 23, 2017.	19810	1 MINTAGE
	Mid Hallmark	[10 T.OZ] [Hallmark in Elongated Octagon] [999+ FINE SILVER] [Serial Number]	Cast Finish	5th series in standard production 5-digit serial variation with ‘-‘ serial prefix anomaly. Ingot -17676 sold privately for $1,250.00 on January 1, 2017.	-17755 -17636 -17676	<50 MINTAGE
	Mid Hallmark	[10 T.OZ] [Hallmark in Elongated Octagon] [999+ FINE SILVER] [Serial Number]	Cast Finish	5th series in standard production 5-digit serial variation with partial ‘2’ and partial ‘3’  serial prefix anomaly.	17706	<5 MINTAGE
	Mid Hallmark	[10 T.OZ] [Hallmark in Elongated Octagon] [999+ FINE SILVER] [Serial Number]	Cast Finish	5th series in standard production 5-digit serial variation with an inverted 8 serial prefix anomaly ddd.  Interesting to note these ingots almost immediately follow the serial progression of the above ‘-‘ prefix bars, indicating the progression of rotary stamp issues.  Ingot 17786 sold via eBay auction for $1,661.00 on October 16, 2021.	‘8’ 18875 ‘8’ 17786 ‘8’ 17788 ‘8’ 17814	<25 MINTAGE
	Mid Hallmark	[10 T.OZ] [Hallmark in Elongated Octagon] [999+ FINE SILVER] [Serial Number]	Cast Finish	Unique prototype production ingot. This bar has a matching 20oz counterpart, also in ‘C’ serial prefix.	C107 C131	<50 MINTAGE
	Mid Hallmark	[10 T.OZ] [Hallmark in Elongated Octagon] [999+ FINE SILVER] [Serial Number]	Cast Finish	6th series in ‘P’ serial prefix variation. One example reportedly sold in April, 2013 for $2,000.00. These pieces were made in haste to supply physical demand during Hunt Brother’s period and demonstrate a hybrid design of T. OZ design and ‘P’ series serial format. Additional details may be found at this LINK.	P000013 P000060 P000116 P000493 P000553 P000647 P000651 P000653	<500 MINTAGE
	Mid Hallmark	[99.9+ FINE SILVER] [Custom ‘SilverTowne’ Hallmark] [10 TR. OZ.] [Serial Number]	Cast Finish	6th series in series in ‘P’ serial prefix and SilverTowne counterstamp variation.  This early variety demonstrates a smaller and thinner serial number font as opposed to the later produced variety depicted directly below.  Note that this series shares serial number assignment range with other P-prefix examples and runs to approximate range of P000325.	P000045 P000306 P000324	<50 MINTAGE
	Mid Hallmark	[99.9+ FINE SILVER] [Custom ‘SilverTowne’ Hallmark] [10 TR. OZ.] [Serial Number]	Cast Finish	6th series in series in ‘P’ serial prefix and SilverTowne counterstamp variation. In-hand study confirms earlier numbers in this variation have casting match to its ‘Engelhard’ 5th series ingot with flat top, while later numbers have pillow top appearance. Between serial P000800 and P001410 the obverse stamping method changed, most noticeably in the rotary stamp application, as demonstrated in the photos. Estimated serial number range P000001 to P001499 shared with Engelhard 5th and 6th series. P000045 sold privately on February 20, 2017 for $2,600.00. P000800 sold privately on March 15, 2017 for $2,500.00. P001065 sold via eBay auction for $2,358.00 on October 21, 2017.	P000045 P000646 P000759 P000800 P001065 P001084 P001151 P001410 P001481	<300 MINTAGE
	Mid Hallmark	[99 9+] [FINE SILVER] [10 TR. OZ.] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	7th series in ‘P’ serial prefix variation, these examples have an obverse and reverse with approximately the same surface area. There are two variations of purity designation in this series. They include approximate serial range P000700 – P000900, which demonstrates a decimal in ’99.9+’. Approximate range P000900 – P001150 demonstrates a space in ’99 9+’. Current estimate is <150 of each variation. The above serial runs are shared with 6th series ‘P’ SilverTowne ingots, shown above. P001324 sold via eBay auction for $1,035.01 and P000948 sold via eBay auction for $995.01 on December 10, 2017.	P000715 P000733 P000835 P000884 P001057 P001064 P001150 P001324	<300 MINTAGE
	Mid Hallmark	[99 9+] [FINE SILVER] [10 TR. OZ.] [Hallmark in Elongated Octagon] [Serial Number]	Waffle Back Cast Finish started around P010000	7th series in ‘P’ serial prefix variation, these examples demonstrate tapered leading edges [side slanting inward from top to bottom] so that the top has more surface area than the bottom. Note the space in ’99 9+’ purity designation. Some early 10th series bars were assigned serial numbers within the high serial range of 7th series during production transition, such as P076324. We believe complete transition from 7th series to standard production 10th series occurred close to serial number P076654. Note the bottom photo shows this variety with a letter ‘K’ below the blank serial prefix stamp. While the Waffle Back pattern was common on these production pieces after serial assignment P010000, it is important to note that there are production anomalies on these examples due to backfilling of serial number assignment. As such, it is not uncommon for a regular cast finish reverse to be observed on an ingot in serial range beyond the approximate estimated staring point of P010000.	P001449 P001761 P002099 P003125 P008187 P009647 P015856 P025069 P025472 P038861 P055027 P062235 P069134 P070032 P074468 P076255 P076477 P076654	<50,000 MINTAGE
	Mid Hallmark	[99 9+] [FINE SILVER] [10 TR. OZ.] [Custom ‘SilverTowne’ Hallmark] [Serial Number]	Cast Finish	8th series in ‘P’ serial prefix and SilverTowne counterstamp variation. Note the space in ’99 9+’ purity designation. Estimated serial number range P001500 to P002499. Ingot P001756 sold via eBay auction for $1,525.00 on March 25, 2017. Our thanks to Gavin C. for the photos of ingot P001975! Additional information may be found at this LINK.	P001592 P001659 P001773 P001975 P001980 P002311 P002341	<300 MINTAGE
	Mid Hallmark	[999+] [FINE SILVER] [10 TR. OZ.] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	9th series in ‘W’ serial prefix variation, produced exclusively at the ‘Engelhard West’ recycling facility operated in Anaheim, California in operation from 1979-1981+/- .  It is possible that production timeframe overlapped on both ‘W’ and ‘P’ series ingots. NOTE: Between W009073 – W009659 the production process changed from grinding excess weight from edges to removing from obverse. We believe this practice was exclusive to the Anaheim recycling facility and have included photos of an early and later production example for comparison as well as two ingots close to this production transition. Estimated serial number range W000001 to W017999.  It is interesting to note the early production examples of this variety are of a wider casting mould, as demonstrated in the photo below.  It appears that this unique casting mould was limited to perhaps the first 75 ingots produced, spanning from serial number W000001 through approximately W000075.  Ingot W000066 sold via eBay auction for $1,195.00 on January 19, 2019.  Ingot W000085 sold privately for $1,200.00 on June 12, 2018. Ingot W012296, pictured below, demonstrates both obverse surface grinding of excess weight and a linen pattern reverse similar to Canadian 10oz and 20oz ingots.	W000014 W000025 W000046 W000066 W000085 W000123 W000704 W001688 W002288 W003585 W004992 W005340 W006661 W007552 W008360 W009651 W010839 W011233 W012296 W012641 W013797 W014218 W015724 W016724 W017488 W017818 W017891 W017968	<18,000 MINTAGE
	Mid Hallmark	[999+] [FINE SILVER] [10 TR. OZ.] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	9th series in ‘W’ serial prefix variation, produced exclusively at the ‘Engelhard West’ recycling facility operated in Anaheim, California in operation from 1979-1981+/- .  Similar to our example above, though demonstrates a unique serial blank over-stamping which reveals additional characters present above the rotary stamp dial, as pictured below.	W001596 W002697 W003748	<10 MINTAGE
	Mid Hallmark	[999+] [FINE SILVER] [10 TR. OZ.] [Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	9th series in ‘W’ serial prefix variation, produced exclusively at the ‘Engelhard West’ recycling facility operated in Anaheim, California in operation from 1979-2000.  Similar to our example above, though demonstrates a unique serial blank over-stamping which reveals additional characters present above and below the rotary stamp dial, as pictured below.  This unique ingot also demonstrates a reverse impression, also pictured.	W003012	<10 MINTAGE
	Mid Hallmark	[999+] [FINE SILVER] [10 TR. OZ.] [Hallmark in Elongated Octagon] [Serial Number]	Waffle Back Cast Finish	10th series in ‘P’ serial prefix variation, last variety in truly old-poured form. Note the reverse of these examples occasionally demonstrate a ‘reverse’ convex stamping impression of the top line found on the observe. We have included multiple photos to demonstrate reverse pattern variations and believe this was caused by an inadvertent stamping of the production line surface when a bar was not present. The stamping force altered the production line surface area in such a way that the hex-screw head pattern also began leaving an impression. Some early 10th series bars were assigned serial numbers within the high serial range of 7th series during production transition, such as P076324. We believe complete transition from 7th series to standard production 10th series occurred close to serial number P076654. This ‘P’ prefix serial run was also more commonly shared with 11th and 12th series 10oz ‘P’ class, 8th series 100oz extruded class and 1st series portrait ‘Tall E’ extruded class.  Note the double-stamped second number ‘1’ in the photo below of ingot P167134.	P076324 P076901 P080047 P096314 P111411 P137727 P153447 P155178 P166500 P167134 P170581	<50,000 MINTAGE
	Mid Hallmark	[999+] [FINE SILVER] [10 TR. OZ.] [Hallmark in Elongated Octagon] [Serial Number]	Waffle Back Cast Finish	10th series in ‘P’ serial prefix variation.  Similar to our above example, though demonstrates individually stamped letter ‘P’ serial prefix font anomaly as shown below.  Ingot P154618 sold on Ebay on 5/18/23 for $895.00.	P120600 P154501 P154618 P170500	<100 MINTAGE
	Mid Hallmark	[999+] [FINE SILVER] [10 TR. OZ.] [Hallmark in Elongated Octagon] [Serial Number]	Waffle Back Cast Finish	10th series in ‘P’ serial prefix variation.  Similar to our above example, though demonstrates individually stamped ‘P1′ serial prefix font anomaly as shown below.   Note the reverse of these examples occasionally demonstrate a ‘reverse’ convex stamping impression of the top line found on the observe.	P136887	<25 MINTAGE
	Mid Hallmark	[999+] [FINE SILVER] [10 TR. OZ.] [Custom COLONIAL REFINING Hallmark] [Serial Number]	Flat Extruded Finish	10th series extruded bar produced by Engelhard for Colonial Refining, Inc. Ingot P001445 sold via eBay auction on March 20, 2022 for $4,050.00.  Ingot P001478 sold via MinEx auction on March 10, 2024 for $6,160.	P001177 P001445 P001466 P001478	<25 MINTAGE
	Mid Hallmark	[999+] [FINE SILVER] [10 TR. OZ.] [Hallmark in Elongated Octagon]	Flat Pressed Finish with Border	11th series prototype bar.	Serial Absent	<5 MINTAGE
	Mid Hallmark	[999+] [FINE SILVER] [10 TR. OZ.] [Hallmark in Elongated Octagon] [Serial Number]	Flat Extruded Finish	11th series prototype bar. Measures 66.29mm x 38.10mm x 12.19mm. Obverse surface area measures 36.83mm due to variances in leading edge angles. Based on production method and shape of this bar, we believe it also possible this is a prototype bar of the 10oz industrial E bar, defined below. Thanks to S.S. for the pictures!  Bar P000001 sold privately on September 18, 2015 for $5,500.00.	P000001	<10 MINTAGE
	Mid Hallmark	[999+] [FINE SILVER] [10 TR. OZ.] [Hallmark in Elongated Octagon] [Serial Number]	Flat Machined Finish	11th series example that Engelhard employees could commission to be made with their initials incorporated into the serial number. Bar IDI 001 was sold via eBay private sale for $2,000.00 on August 29, 2015. These bars were originally produced with a brilliant reflective finish.	IDI 001 MDN 001	<50 MINTAGE
	Mid Hallmark	[999+] [FINE SILVER] [10 TR. OZ.] [Hallmark in Elongated Octagon] [Serial Number]	Flat Machined Finish	11th series in ‘P’ serial prefix variation, one seller stated that they bought their bar in 1983 [P299370]. Note the reverse of these examples occasionally demonstrate a ‘reverse’ convex stamping impression of the top line found on the observe. We believe this was caused by an inadvertent stamping of the production line surface when a bar was not present. The stamping force altered the production line surface area in such a way that the hex-screw head pattern also began leaving an impression. Evidence suggests this span was shared with 100oz ‘W’ bars and later ‘P’ bars that were within the +/- P090000 – P430000 range. Some examples issued in plastic protective cover, pictured below and very rarely seen.	P089076 P090763 P110500 P150918 P165734 P210479 P211984 P265799 P299370 P392689 P417694 P429244	<200,000 MINTAGE
	Mid Hallmark	[999+] [FINE SILVER] [10 TR. OZ.] [Hallmark in Elongated Octagon] [Serial Number]	Flat Machined Finish	11th series in ‘P’ serial prefix variation, similar to our example above except in ‘EP’ serial prefix.	EP104814 EP104818	<50 MINTAGE
	Mid Hallmark	[999+] [FINE SILVER] [10 TR. OZ.] [Hallmark in Elongated Octagon]	Flat Machined Finish	11th series in ‘P’ serial prefix variation, similar to our example above except in serial absent format.	N/A	<100 MINTAGE
	Mid Hallmark	[Custom ‘Gold Standard Corporation’ Hallmark in Elongated Octagon] [Serial Number] [999+] [FINE SILVER] [10 TR OZ]	Flat Machined Finish	11th series ‘P’ serial prefix in Gold Standard counterstamped variation. Despite relatively high estimated mintage, these are rarely seen. Additional details regarding the Gold Standard counterstamp may be found at this LINK.	P418567 P419436 P419437	<500 MINTAGE
	Mid Hallmark	[Custom ‘Gold Standard Corporation’ Hallmark in Elongated Octagon] [Serial Number] [10 TR. OZ.] [FINE SILVER] [.999+]	Flat Machined Finish	11th series ‘P’ serial prefix in Gold Standard counterstamped variation. Similar to our example above, though demonstrates reverse placement of weight and purity stampings. Despite relatively high estimated mintage, these are rarely seen. Bar P430535 sold via eBay auction on April 2, 2018 for $895.00 BIN.  Bar P430279 sold via eBay auction on July 9, 2023 for $1,150.00.  Bar P430258 sold via eBay auction on March 20, 2024 for $1,425.00.  Additional details regarding the Gold Standard counterstamp may be found at this LINK.	P429988 P430258 P430457 P430459 P430460 P430808	<500 MINTAGE
	Top Hallmark	[Hallmark in Elongated Octagon] [10 TROY OZ.] [999+ FINE SILVER] [Serial Number]	Hallmark in Elongated Octagon, repeated 3 full times, course pebbled finish	12th series Variety “A” in ‘P’ serial prefix transitional piece, last of the ‘P’ series run, less frequently seen. This particular example is a very rare early variety of the more commonly found example listed directly below. Most notable difference on the obverse is font thickness and spacing of the purity ‘+’ stamp, and the hallmark letter thickness and spacing from the elongated octagonal hallmark border on the reverse.  Please note the letter shape of ‘G’ in the reverse hallmark as it is notable and easily observed.	P100276 P102043 P103395 P104653	<250 MINTAGE
	Top Hallmark	[Hallmark in Elongated Octagon] [10 TROY OZ.] [999+ FINE SILVER] [Serial Number]	Hallmark in Elongated Octagon, repeated 3 full times, course pebbled finish	12th series Variety “A” in ‘P’ serial prefix transitional piece, last of the ‘P’ series run, less frequently seen. This serial number run was shared with 10th and 11th ‘P’ series bars as well as 100oz ‘P’ series bars. This particular example is a more commonly found variety of the more rare early variety listed directly above. Most notable difference on the obverse is font thickness and spacing of the purity ‘+’ stamp, and the hallmark letter thickness and spacing from the elongated octagonal hallmark border on the reverse.  Please note the letter shape of ‘G’ in the reverse hallmark as it is notable and easily observed. Note that some serial numbers are duplicated with 12th series ‘C’ prefix, as seen in P118193 and C118193, listed below.	P100612 P108647 P114579 P117731 P118193 P120681 P126365 P128815	<10,000 MINTAGE
	Top Hallmark	[Hallmark in Elongated Octagon] [10 TROY OZ.] [999+ FINE SILVER] [Serial Number]	Smooth pebbled finish	12th series Variety “B”, similar to our example above but in “C”serial prefix variation, except the reverse demonstrates a fully-pebbled finish. Note that some serial numbers are duplicated with 12th series ‘P’ prefix, as seen in C118193 and P118193, listed above. Serial range span from C100000 – C149000.	C108035 C113645 C118193 C145464	<50,000 MINTAGE
	Top Hallmark	[Hallmark in Elongated Octagon] [10 TROY OZ.] [999+ FINE SILVER] [Serial Number]	Hallmark in Elongated Octagon, repeated 3 full times, smooth pebbled finish	12th series Variety “C”, also in ‘C’ serial prefix variation, similar to our example above except in ‘C’ prefix designation. Reverse of these bars is same as Variety “A” above. Serial range span from C149001 – C299999 is shared with the 5oz 9th series ‘C’ prefix between C200000 and C249999.  Bar C183017 has an inverted reverse pattern, which we believe is a rare stamping error.  Bar C272625 demonstrates a ‘D’ stamping error just below the ‘C’ serial number prefix, which resulted from the alphabetical rotary gang stamp dial slipping out of place.	C154265 C174049 C183017 C202672 C215625 C229605 C250695 C254840 C272625 C294643	<125,000 MINTAGE
	Mid Hallmark	[Serial Number] [Custom ‘Gold Standard Corporation’ Hallmark in Elongated Octagon] [999+] [FINE SILVER] [10 TR. OZ]	Smooth Machined Finish	Exclusive 10oz commercial bar produced for the Gold Standard Corporation. Please note that over our course of observing market availability, we have observed an approximately equal amount of examples in serial absent variation, which are presented directly below.	508 5023 5534 5558 6001 6109 6254 6349 7249 7251 7253 9665 10013 10029	<5,000 MINTAGE
	Mid Hallmark	[Custom ‘Gold Standard Corporation’ Hallmark in Elongated Octagon] [999+] [FINE SILVER] [10 TR. OZ]	Smooth Machined Finish	Exclusive 10oz commercial bar produced for the Gold Standard Corporation.  Similar to our example directly above, though in serial absent variation.	Serial Absent	<5,000 MINTAGE
	Octagonal E-Insert	[Hallmark in Octagon] [10 OZ] [999. FINE] [Serial Number]	Flat Extruded Finish	Extruded 10oz industrial bar. Example -000373 old for $1,302.56 on November 3, 2016 via eBay auction. Additional information may be found at this LINK.	-000373 -000510 -000518	<50 MINTAGE
	Top Hallmark	[Serial Number]	[Hallmark in Elongated Octagon] [999 FINE] [10 OZ]	Extruded 10oz bar in less frequently seen full-hallmark variation. Interesting to note the reversal of obverse and reverse on this variety.	000684 -000828 -000874 -000876	<25 MINTAGE
	Octagonal E-Insert	[10 OZ] [Hallmark in Octagon] [999. FINE]	[Serial Number] [PIM Counterstamp]	Extruded 10oz industrial bar with PIM counterstamp.	-000006 -000007 -000008 -000025 -000214	<25 MINTAGE

EXAMPLE	HALLMARK	OBVERSE	REVERSE	COMMENTARY	SAMPLE SERIAL NUMBERS	ICR | ESTIMATED MINTAGE
	Top Hallmark	[Australian Engelhard Hallmark] [999+SILVER] [10OZ]	Cast Finish	10oz ingot in Australian variation, produced at the Engelhard refinery in Thomastown, Australia. Thanks to danman49 for this discovery!	N/A	<50 MINTAGE

Our study of Canadian 10oz weight class pieces included several hundred examples and was conclusive enough to justify the presentation of five [5] series of ingots and three [3] series of commercial bars. Our commentary column includes general information observed on the majority of pieces studied. However, it is important to note that there were exceptions found during our studies. For example, an ingot may occasionally include a serial font specific to the United States whereas the majority of other pieces within the same series demonstrate a Canadian serial font.

We do not believe that serial number assignment is necessarily indicative of production order and that there were some variations in prefix assignment across all series. Please also note that we have occasionally observed casting mould variation on Canadian produced ingots and it is not a terribly uncommon characteristic.

We are confident that the 2nd and 4th series ingots were produced simultaneously and stamped with two different hallmark and stamp set placements. The serial numbers observed across these two series of ingots are interspersed and are indicative of simultaneous production for both variety at the same production facility. We do, however, believe that the differences observed on these two series are significant enough to warrant the assignment of separation.

EXAMPLE	HALLMARK	OBVERSE	REVERSE	COMMENTARY	SAMPLE SERIAL NUMBERS	ICR | ESTIMATED MINTAGE
	Mid Hallmark	[10.000] [999+] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	1st series ingot in Canadian type ‘A’ variation. The placement of this ingot’s weight/purity stampings and casting dimension are familiar to its 2nd series United States counterpart. Canadian ingots across all weight class are typically observed in 6-digit serial format with purity stamping on left and weight class on right. The initial run of this variety was in a rare 5-digit serial assignment. Based on this ingot’s dimension, we speculate Canada was initially provided with casting moulds used by the United States 3rd series 5-digit ingots at that time for this 1st series of Canadian ingots, as this 1st series also demonstrates the more rounded edges, unlike the 2nd series. Interesting to note the serial font on these ingots are exclusive to this variety, specifically the ‘1’ and ‘3’ numbers.  Ingot 85808 sold on December 19, 2022 on eBay for $1,700.00.	85808 85810 85837 85878 85945 88831 88832	<250 MINTAGE
	Mid Hallmark	[10.000] [999+] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	1st series ingot in Canadian type ‘B’ variation.  Identical to our type ‘A’ variety, above, but demonstrates a narrower placement of the weight/purity stampings as shown in the photo. The left column below shows ingot 90180 with an original 90280 serial overstamped to 90180.	90153 90180 90280 90890 90923	<250 MINTAGE
	Mid Hallmark	[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	1st series type ‘C’ ingot in Canadian variation. Similar to our 1st ‘A’ and ‘B’ series examples, above, but demonstrates exceedingly rare reverse placement of purity and weight class stamping anomaly. This ingot features the same font, casting mould dimensions and serial number assignment range as its other 1st series ingot counterparts.  Note the spacing variance of purity/weight between these two examples.  We believe this is a transitional variety to the 2nd series ingots.  Our appreciation to Dan S. for this astute discovery.	93168 93188 95369	<50 MINTAGE
	Mid Hallmark	[10.000] [999+] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	2nd series ingot in Canadian variation. This ingot shares the same casting mould as our 1st series ingot, above. Note the reverse placement of weight and purity stampings, with 10.000 on left and 999+ to right, as well as the difference in serial font – the numbers ‘1’ and ‘3’ specifically.  It appears that production was split about equally between the two variations of leading ‘1’ serial number fonts.  These variations include the ‘I’ without a base, top photo, and ‘1’ with a base, as seen on our bottom photo.	102655 102896 103065 103092 103186 103527	<500 MINTAGE
	Mid Hallmark	[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series ingot in Canadian variation. This ingot appears to share the same casting moulds as the 1st and 2nd series ingots, defined above. The number ‘1’ serial font is unique to this variety, and the variety directly below, in that it demonstrates a slightly angled top bar and a full horizontal bottom bar.The range of 107xxx to 110xxx serial numbers was back-filled to an available earlier run, though placement of weight and purity stampings are of new format. Our appreciation to Dan S. for this discovery!	107203 107238 107299 108391 108662 108746 109216 110197 110582	<2000 MINTAGE
	Mid Hallmark	[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series ingot in Canadian variation. Similar to our variety directly above, though the most distinguishing characteristics are wider spacing of the purity and weight class stampings and thinner serial number font.   Please note there are variations in the ‘1’ serial font as demonstrated in the photo to the left, with the 175446 being the anomaly.  This variety also is of a unique casting mould that resulted in side edges of this variety being more square in shape, without the tapered angle common to other 10oz Canadian examples. The photo below demonstrates the casting mould size variation.  Our appreciation to Dan S. for this discovery!	175026 175330 175352 175412 175446	<500 MINTAGE
	Mid Hallmark	[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series ingot in Canadian variation. Similar to our variety directly above, though demonstrates a thicker serial font.	177908 178384 178726 178978 179238 179302 180002 180138	<2,500 MINTAGE
	Mid Hallmark	[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series 10oz ingot in Canadian variation with thinner serial number font. We believe theses ingots were produced using a Canadian casting mould and are occasionally seen with slight differences in purity and weight class stamp placements.	129730 129803 129834	<150 MINTAGE
	Mid Hallmark	[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series 10oz ingot in Canadian variation, similar to our example above though demonstrates a thicker serial number font.  This is the most commonly produced series and observed with several series-specific anomalies.	133616 154022 189883 192183 195660 197863 203697 220969 229584 244590 249872 257751 261101 267266 268166 280417 280597 280615	<50,000 MINTAGE
	Mid Hallmark	[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Patterned Cast Finish	3rd series 10oz ingot in Canadian variation. These examples demonstrate a ‘linen’ pattern on the edges and reverse.	189946 190334 192212 192521 195659 195660	<500 MINTAGE [Included in <50,000 3rd series estimate, above]
		[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Patterned Cast Finish	3rd series 10oz ingot in Canadian variation. These examples demonstrate a ‘waffle’ pattern on the edges and reverse.	195942	<250 MINTAGE
	Mid Hallmark	[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Heavy Grid Cast Finish	3rd series 10oz ingot in Canadian variation. These examples demonstrate a ‘heavy grid’ pattern reverse. Ingot 197863 sold privately for $600.00 on January 1, 2017.	197635 197863	<1,000 MINTAGE [Included in <50,000 3rd series estimate, above]
	Mid Hallmark	[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series 10oz ingot in Canadian variation. These examples demonstrate a ‘1•’ serial prefix anomaly, observed under samples in the next column. Ingot 1•203098 sold via eBay auction on September 28, 2017 for $2,007.00.	1•203098 1•203136 1•203141 1•203173 1•203495	<100 MINTAGE [Included in <50,000 3rd series estimate, above]
	Mid Hallmark	[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series 10oz ingot in Canadian variation. This variety demonstrates a ‘1•’ serial prefix anomaly and a reverse stamping impression anomaly.  Ingot 1•203210 sold privately in June, 2017 for $1,500.00.	1•203210	<10 MINTAGE
	Mid Hallmark	[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series 10oz ingot in Canadian variation. These examples demonstrate a ‘I.’ serial prefix anomaly, observed under samples in the next column. Ingot l.203291 sold privately on March 15, 2017 for $2,500.00.	1•203161 1•203232 1•203490 1•232202 1•232251 1•232253 1•232285 1•232288 1•232383 1•232438 1•232472	<200 MINTAGE [Included in <50,000 3rd series estimate, above]
	Mid Hallmark	[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series 10oz ingot in Canadian variation. These examples demonstrate a ‘-1′ serial suffix anomaly, observed under samples in the next column. Ingot 247190-1 sold privately on March 15, 2017 for $2,200.00.	246984-1 246988-1 247002-1 247118-1 247144-1 247190-1 247191-1 247202-1 247251-1	<250 MINTAGE [Included in <50,000 3rd series estimate, above]
	Mid Hallmark	[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	3rd series 10oz ingot in Canadian variation, similar to our examples above except for ‘2’ serial prefix anomaly.	2 133647	<10 MINTAGE [Included in <50,000 3rd series estimate, above]
	Mid Hallmark	[999+] [10•000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	4th series ingot in Canadian variation. Canada-specific casting mould and first variety to include ‘floating decimal’ on weight class as well as new font for purity 9′s common to Canadian production. This series also includes a new hallmark with larger letters within elongated octagon and a smaller center ‘dot’ on the Bull Logo. Although most examples studied demonstrated Canadian serial number font with occasional United States serial font variation, we believe this series ingot to be the first truly ‘All Canadian’ 10oz variety. These ingots are typically seen with the purity stamp directly above the ‘Bull Logo’ and the weight stamp further to the right. Known examples include 172xxx, 187xxx, 188xxx and 194xxx serial range. Approximate dimensions of 4th series variety are 2 ½” x 1 7/16″ x ½”.	172621 187951 188045 188083 188170 194078 200686	<2,000 MINTAGE
	Mid Hallmark	[999+] [10•000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	5th series ingot in Canadian variation. Similar to 4th series above except wider casting mould was used. Most examples studied demonstrate Canadian serial number font although there were occasional United States serial font variations. These ingots are typically seen with the purity stamp directly above the ‘Bull Logo’ and the weight stamp further to the right. Approximate dimensions of 5th series variety are 2 ¾” x 1 ¼” x ½”.	121244 169914 173228 186751 191744 194795 204308	<5,000 MINTAGE
	Mid Hallmark	[999+] [10•000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Pattern Cast Finish	5th series 10oz ingot in Canadian variation. These examples demonstrate a ‘waffle’ pattern on the edges and reverse. Ingot 195002 sold privately on March 10, 2017 for $1,200.00. Approximate dimensions of 5th series variety are 2 ¾” x 1 ¼” x ½”.	194866 194901 195002 195091	<100 MINTAGE [Included in <5,000 5th series estimate, above]
	Mid Hallmark	[999+] [10•000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Patterned Cast Finish	5th series 10oz ingot in Canadian variation. These examples demonstrate a unique ‘waffle’ pattern on the edges and reverse similar to the above 3rd series example.	195118	<250 MINTAGE
	Mid Hallmark	[999+] [10•000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Heavy Grid Cast Finish	5th series 10oz ingot in Canadian variation. These examples demonstrate a ‘heavy grid’ pattern reverse. Approximate dimensions of 5th series variety are 2 ¾” x 1 ¼” x ½”.	200740 200743 200764 200903 200904 200905 200917	<50 MINTAGE [Included in <5,000 5th series estimate, above]
	Mid Hallmark	[999+] [10•000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	5th series 10oz ingot in Canadian variation in ‘1•’ serial prefix anomaly. Approximate dimensions of 5th series variety are 2 ¾” x 1 ¼” x ½”.	1•203062 1•203069 1•203301 1•203328 1•203349	<50 MINTAGE [Included in <5,000 5th series estimate, above]
	Mid Hallmark	[999+] [10•000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	5th series 10oz ingot in Canadian variation, similar to our example above except for ‘2’ serial prefix anomaly. Ingot 2 134325 sold privately on February 20, 2017 for $2,450.00. Approximate dimensions of 5th series variety are 2 ¾” x 1 ¼” x ½”.	2 133636 2 133686 2 133847 2 134307 2 134325 2 134862	<100 MINTAGE [Included in <5,000 5th series estimate, above]
	Mid Hallmark	[999+] [10•000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Cast Finish	5th series 10oz ingot in Canadian variation. This serial number prefix matches the 27xxxx format of 1st series commercial bars, directly below, likely of the very last 5th series ingots produced. The letter ‘A’ prefix was added to differentiate and possibly eliminate a duplicate serial number of an actual 1st series commercial bar. Ingot A270012 sold privately on February 20, 2017 for $2,200.00.  Ingot A270026 sold on eBay 2/10/23 for $2,285.  Approximate dimensions of 5th series variety are 2 ¾” x 1 ¼” x ½”.	A 270011 A 270012 A 270026 A 270038 A 270088	<100 MINTAGE [Included in <5,000 5th series estimate, above]
	Mid Hallmark	[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Smooth Machined Finish	1st series 10oz prototype  example in Canadian commercial bar variation.	000023	<25 MINTAGE
	Mid Hallmark	[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Smooth Machined Finish	1st series 10oz example in Canadian commercial bar variation. A keen eye will observe a dot in the center of the bull logo. The 2nd series, below, does not.	269505 269971 270775 272474 275254 275303 275454 275803	<5,000 MINTAGE
	Mid Hallmark	[999+] [10.000] [Bull Hallmark in Elongated Octagon] [Serial Number]	Smooth Machined Finish	2nd series 10oz example in Canadian commercial bar variation, similar to our 1st series above except there exists a wider spacing between weight decimal and following zero, also the bull logo carries a different angle and lacks the center dot. Our archives indicate that some examples were used for engraving, one having been engraved for an event in 1984, suggesting production period.	282051 284795 285830 286603 305305 306965 309495 327292 327950	<5,000 MINTAGE
	Mid Hallmark	[FINE SILVER] [999] [Bull Hallmark in Elongated Octagon] [10 TROY OUNCE] [Serial Number]	Smooth Machined Finish	3rd series 10oz example in Canadian variation.	328866 328872 328904 328928	<100 MINTAGE

• Most Engelhard 10oz class silver bars have serial numbers.
• Our archives indicate that the 6-digit Canadian variety serial number did not exceed 330000 [with several minor variations]. They began with poured examples and were followed by machined examples. It is possible that, in some cases, two variety were produced simultaneously.
• Our archives indicate that P series likely preceded W series, both of which preceded the final production C series variety. In the case of 10oz examples, only three letters of P, W and C were used and in that order.
• There may be duplicate serial numbers [but not of the same design] due to the Eagle/Flag logo production ‘rolling over’.
• There are unsubstantiated claims that ‘P’ represents ‘poured’ and ‘C’ represents ‘cast’ in serial prefix. We challenge this theory, as it was the casting method by which Engelhard produced their poured ingots. Casting is quite similar to making ice cubes in a freezer, in that liquid [molten metal] is used to create a solid ingot by use of a mould. As such, the terms ‘poured’ and ‘cast’ are synonymous. Further, Engelhard could not have designated a ‘P’ prefix in anticipation of the ‘C’ prefix series as advancement of their production technology was likely not foreseeable when they designated the ‘P’ prefix. There are also claims that ‘W’ represents ‘wide’ series, which is doubtful because the majority of 10oz pieces were produced in wide [landscape] variety. We speculate, at this time, that ‘W’ is representative of the Engelhard ‘West’ Facility at which they were produced and that ‘P’ and ‘C’ were likely arbitrarily designated.