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AG | 5oz


This page contains our current information on 5oz class Engelhard Legacy Ingots and standard production bars. Some of Engelhard’s most notable Legacy Ingots were early production 5oz bars.  You will see below how rudimentary and varied the stamping methods were on these early examples, and it is this raw and classic appeal that many collectors find so alluring. With exception of these very limited Legacy Ingots illustrated below, Engelhard 5oz examples were considered standard production bars, yet only about 90,000  5oz bars were produced in total.  Nearly one-third of these bars were of the common extruded 9th series ‘C’ variety, with the balance divided between 30+ varieties over a span of 20+ years in the United States and Canada, rendering these bars highly collectible.  Also, important to note, is that a good percentage of these bars were melted over the years.

Presented below, we define all currently known varieties with pictures, serial numbers and mintage estimates.  There are surely a few more we haven’t encountered yet, and we welcome collectors to share any new discoveries.  We hope you enjoy your visit!

Portrait Varieties Landscape Varieties [United States]
Landscape Varieties [Australian]
Landscape Varieties [Canadian]
Serial Number Reference

Portrait Varieties:
EXAMPLE HALLMARK OBVERSE REVERSE COMMENTARY SAMPLE
SERIAL
NUMBERS
ICR | MINTAGE
Screen Shot 2014-03-07 at 1.20.55 PM ‘E’ in Elongated Octagon [Statue of Liberty]  [LIBERTY] [Statue of Liberty Torch Logo]  [LIBERTY TRADE SILVER]  [.999+ FINE SILVER]  [FIVE TROY OUNCES]  [SERIAL NUMBER]  [© 1986 MTB]  [UNITED STATES OF AMERICA]  Specialty collector bar produced by Manfra, Tordella & Brookes, 1986 mintage.  Additional information regarding the MTB counterstamp may be found at this LINK. A 0248
A 0423
A 1187
A 2755
A 2965
A 4880
A 5485
ICR Tier 3 - Small 7,500
MINTAGE
09-thof-9 copy Maple Leaf Hallmark [Engelhard ‘Maple Leaf’ Hallmark]  [ASSAYERS & REFINERS]  [5 TROY OUNCES]  [FINE SILVER 999 in Rectangle]  [Serial # in Rectangle with ‘Bull’ Logo] Smooth Machined Finish with Border 5oz pressed commercial bar in Canadian variation, originally issued in sealed plastic.  This variety matches the 10oz Maple Leaf counterpart.  Bar 410107 sold via eBay on March 11, 2016 for $607.01. 410107
410114
411749
ICR Tier 1 - Small<250
MINTAGE
 
Landscape Varieties [United States]:
EXAMPLE HALLMARK OBVERSE REVERSE COMMENTARY SAMPLE
SERIAL
NUMBERS
ICR | MINTAGE
5 ounce (oz) Engelhard Silver Bar, 5-Digit, Logo on Top, Poured, No Plus, Obverse Top Hallmark [Hallmark in Elongated Octagon]  [5.000]  [999]  [Serial Number] Cast Finish 1st series ingot.  Crude casting finish, non ‘+’ variety.  Ingot 00384 sold privately on March 3, 2017 for $3,500.00. 00359
00364
00384
00394
ICR Tier 1 - Small<50
MINTAGE
IMG_8961 Top Hallmark [Hallmark in Elongated Octagon]  [5.000]  [999]  [Serial Number] Cast Finish 2nd series ingot.  Smoother casting finish, serial number range begins at 1,000. 01633
01651
02244
02733
ICR Tier 1 - Small <200
MINTAGE
5oz AG - 01220 copy Mid Hallmark [5.000]  [999+]  [Hallmark in Elongated Octagon]  [Serial Number] Cast Finish 3rd series ingot.  Casting dimension and distance between weight/purity stamps match those of 1st and 2nd series. Ingot 01253 sold privately on March 10, 2017 for $1,000.00. 01212
01220
01253
01306
ICR Tier 1 - Small <100
MINTAGE
photo-52 copy 2
IMG_7667
Mid Hallmark [5.000]  [999+]  [Hallmark in Elongated Octagon]  [Serial Number] Cast Finish 4th series ingot in 4-digit serial number variation.  Weight class and purity stampings are drawn closer together than previous variety, also common to all subsequent variety.  This obverse stamp set layout is familiar amongst later production 4th series variety.  Ingot 3805 sold privately on March 10, 2017 for $3,000.00. 3711
3760
3805
ICR Tier 1 - Small <50
MINTAGE
IMG_4232 copy Mid Hallmark [5.000]  [999+]  [Hallmark in Elongated Octagon]  [Serial Number] Cast Finish 4th series ingot in large 4-digit serial number variation.  Ingot 3714 sold for $1,380.00 on April 3, 2016 via eBay auction. 3551
3714
ICR Tier 1 - Small <50
MINTAGE
Engelhard_5Oz_NoSerialThreeZeroesObvSmall Mid Hallmark [5.000]  [999+]  [Hallmark in Elongated Octagon] Cast Finish 4th series ingot in unique serial absent variation.  An example sold privately on March 3, 2017 for $2,500.00. N/A ICR Tier 1 - Small <100
MINTAGE
5 digit small gapMid Hallmark[5.000]  [999+]  [Hallmark in Elongated Octagon]  [Serial Number]Cast Finish 4th series in 5-digit serial variation with leading zero format.04796
05056
05081
05329
05426
ICR Tier 1 - Small<250
MINTAGE
1 copy 2IMG_4370 copy5oz AG - 52335 copy Mid Hallmark [5.000]  [999+]  [Hallmark in Elongated Octagon]  [Serial Number] Cast Finish 4th series ingot in standard production variety.  Interesting 52335 example, also pictured, demonstrates a double-die hallmark. Basic casting shape and finish, as well as stamp set placement will vary slightly over entire serial number range.   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.
15648
18938
19038
19151
15034
25033
25034
35871
40014
48856
52335
61925
65871
78950
85539
ICR Tier 2 - Small <2,500
MINTAGE
IMG_4375 copyIMG_4381 Mid Hallmark [5.000]  [999+]  [Hallmark in Elongated Octagon]  [Serial Number]  [MFR Designation] Cast Finish 4th series in ‘MFR’ [Metals Fabrication & Refining] designation.  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.  We believe there were intermittent overflow serial assignments with non ‘MFR’ designated ingots and that serial range is not indicative of mintage. 35704 ‘MFR’
35794 ‘MFR’
36517 ‘MFR’
47242 ‘MFR’
54102 ‘MFR’
54175 ‘MFR’
54187 ‘MFR’
60175 ‘MFR’
62311 ‘MFR’
62359 ‘MFR’
68754 ‘MFR’
74175 ‘MFR’
ICR Tier 2 - Small <700
MINTAGE

[Included
in 2,500
4th series
estimate,
above]
5oz-United-07930 Left Hallmark [Custom ‘UNITED’ Hallmark]  [5.000]  [999+]  [Serial Number] Cast Finish 4th series in United Refining counterstamp variation.  Ingot 07913 sold via eBay auction for $1,027.55 on March 22, 2015.  Ingot 08239 sold privately for $2,500.00 on February 18, 2017.  Additional information regarding the United Refining & Smelting counterstamp may be found at this LINK. 07857
07901
07913
07930
07964
08002
08003
08239
ICR Tier 1 - Small <100
MINTAGE
SONY DSC Hallmark Absent [5.000]  [999+]  [Serial Number] Cast Finish 4th series in hallmark absent variation.  Believed to be an ingot produced for United Refining that was never hallmarked.  Ingot 07993 has an interesting Freemason stamp on the reverse. 07305
07993
ICR Tier 1 - Small <50
MINTAGE
5oz-Silver-Diamond-Corporation-12 Mid Hallmark [5.000]  [999+]  [Custom ‘SILVER DIAMOND CORPORATION’ Hallmark]  [Serial Number] Cast Finish 4th series in Silver Diamond Corporation counterstamp variation.  These ingots were produced in a very tight serial  run that was shared with other variety, including the 3oz Ingot Mines. Ingot 329 sold privately on February 18, 2017 for $2,000.00.  Additional information regarding the Silver Diamond Corporation counterstamp my be found at this LINK.
12
179
185
237
301
329
371
494
ICR Tier 1 - Small <250
MINTAGE
IMG_4406 copyphoto-79 copy Mid Hallmark [5.000]  [999+]  [Hallmark in Elongated Octagon]  [Serial Number] Cast Finish 5th series standard production ingot.  Large Mid Hallmark similar to 8th series design, often observed with a weak center stamp.  Despite this ingot’s larger center hallmark, we believe this is the next series in progression based on weight class stamp and serial number run.  Some serial numbers for this variety overlap those of 6th series variety.  We believe the serial number range is 50000 to 53999 with many 52xxx range assigned to 4th series pieces. 50077
50080
50090
51285
51840
52081
52144
53544
53579
ICR Tier 2 - Small <1,300
MINTAGE
Screen Shot 2014-03-11 at 2.57.08 PM$_57 Mid Hallmark [5.000]  [999+]  [Hallmark in Elongated Octagon]  [Serial Number] Cast Finish [FPM] Counterstamp 5th series standard production ingot.  Large Mid Hallmark design in [FPM] Fleet Precious Metals counterstamp.  Additional information may be found at this LINK. 52288
52326
52380
ICR Tier 1 - Small <100
MINTAGE


[Included
in 1,300
5th series
estimate,
above]
IMG_4390 copyIMG_4510 copyIMG_4373 copy Mid Hallmark [5.ooo]  [999+]  [Hallmark in Elongated Octagon]  [Serial Number] Cast Finish 6th series standard production ingot. Note that the ‘5’ is larger than the zeroes.  Some serial numbers for this series include a zero prefix which appears to fall within the 054200 – 054999 range.  Total run of this series spans from 52750 to 55499, although this run was also shared with the 4th and 5th series above.   52750
53047
054246
054290
54024
54484
54744
55023
55282
ICR Tier 2 - Small <2,000
MINTAGE
IMG_4408 copy Mid Hallmark [5.ooo]  [999+]  [Hallmark in Elongated Octagon]  [Serial Number] N/A One known example.  Additional information regarding this unique example, including his Australian relative, Ted, may be found at this LINK.
54307 ICR Tier 1 - Small ONE TOO MANY
IMG_4360 copyunnamedIMG_4367 copy
Mid Hallmark [5 T.OZ]  [Hallmark in Elongated Octagon]  [999+ FINE SILVER]  [Serial Number] Cast Finish 7th series standard ‘T.OZ’ production ingot.  Some bars were assigned a ‘-‘ minus prefix in the 56856 to 57390 range.  It further appears that a leading ‘zero’ was added in the 059200 to 059400 range and the design was changed shortly thereafter.  All three varieties are pictured for reference and, based on known serial numbers, we believe serial numbers span from 55500 to 061599. 55547
56524
56801
-56856
57018
-57192
-57390
58068
58755
59231
059403
059941
059992
060268
061077
061554
ICR Tier 2 - Small <4,000
MINTAGE
IMG_7866
IMG_7865
Mid
Hallmark
[5 T.OZ]  [Hallmark in Elongated Octagon]  [999+ FINE SILVER]  [Serial Number]Cast Finish7th series ‘T.OZ’ ingot.  This variation demonstrates an exceedingly rare ‘reversed’ convex stamping impression on the reverse, pictured, much like the reverse observed on 9th series ‘P’ prefix 10oz bars.  This stamping includes a double mirror-image of the 5 T.OZ detail as well as the larger hallmark found on 7th series 10oz  ingots.  Enlargement click of reverse enabled for better viewing of these details.  Ingot 061496 sold via eBay auction on September 18, 2017 for $860.00.061496
061515
061547

ICR Tier 1 - Small<50
MINTAGE
IMG_1802 Mid Hallmark [5 T.OZ]  [Hallmark in Elongated Octagon]  [999+ FINE SILVER] Cast Finish 7th series ‘T.OZ’ ‘ ingot in rare serial absent variation.  One example sold via eBay auction on  October 12, 2016 for $853.00. N/A ICR Tier 1 - Small <100
MINTAGE
5 ounce (oz) Engelhard Silver Bar, P-Series, Poured, Obverse 5 ounce (oz) Engelhard Silver Bar, P-Series, Poured, Reverse Mid Hallmark [999+]  [FINE SILVER]  [5 TR. OZ]  [Hallmark in Elongated Octagon]  [Serial Number] Flat Machined Finish 8th series bar in ‘P’ serial prefix variation.  These bars are very similar in appearance to the common 10oz 10th series ‘P’ bars, yet this 8th series 5oz example had a surprisingly short production run for a later period Engelhard bar.  While the serial run of this series is projected from P000001 through P0011800, we have noticed several sizeable gaps in serial ranges, and such gaps are utilized by other sizes and varieties of Engelhards, suggesting that the mintage of these may be far less than 10,000.
P000039
P000135
P000841
P001431
P001949
P002553
P002558
P003538
P004632
P005249
P006380
P007763
P008169
P009476
P010353
P011770
ICR Tier 3 - Small <10,000
MINTAGE
5 ounce (oz) Engelhard Silver Bar, C-Series, Stamped, Obverse 5 ounce (oz) Engelhard Silver Bar, C-Series, Stamped, Reverse Top Hallmark [Hallmark in Elongated Octagon]  [5 TROY OZ.]  [999+ FINE SILVER]  [Serial Number] Hallmark in Elongated Octagon, repeated 3 full times, smooth pebbled finish 9th series bar in ‘C’ serial prefix variation. Like the 8th series ‘P’ 5oz bar, this series resembles its 10oz 12th series ‘P’ and ‘C’ counterparts.  This serial number run was shared with the 10oz 12th series ‘C’ prefix bars. C200754
C200900
C206550
C214095
C216357
C218540
C223080
C244572
C244607
ICR Tier 4 - Small <25,000
MINTAGE
IMG_4411 copy Octagonal E-Insert [5 OZ]  [Hallmark in Octagon]  [999. FINE] [Serial Number] Extruded 5oz bar.  Additional information may be found at this LINK. -000322
-000324
-000331
ICR Tier 1 - Small <200
MINTAGE
5oz Extrude - Full Logo Top Hallmark [Serial Number] [Hallmark in Elongated Octagon]  [999 FINE]  [5 OZ]  Extruded 5oz bar in less frequently seen full-hallmark variation.  Interesting to note the reversal of obverse and reverse on this variety.  Additional information may be found at this LINK. -000731
-000937
-000941
-000949
ICR Tier 1 - Small <100
MINTAGE

Landscape Varieties [Australian]:
EXAMPLE HALLMARK OBVERSE REVERSE COMMENTARY SAMPLE SERIAL NUMBERS ICR | MINTAGE
5oz-AG-Australia1 Top Hallmark [Australian Engelhard Hallmark]  [5 OZ]  [999+SILVER] Cast Finish 5oz ingot in Australian variation, produced at the Engelhard refinery in Thomastown, Australia.  This variety lacks a decimal or dot between the ‘5’ and ‘OZ’, and the top of the ‘5 OZ’ faces the edge of the bar. N/A ICR Tier 1 - Small <250
MINTAGE
e 5's copy Top Hallmark [Australian Engelhard Hallmark]  [5•OZ]  [999+SILVER] Cast Finish 5oz ingot in Australian variation, produced at the Engelhard refinery in Thomastown, Australia.  With this more rare example, there is a dot between the ‘5’ and ‘OZ’, and the top of ‘5 OZ’ faces the inside of the bar.  One example reportedly purchased new from Australian Bullion Company in 1984. N/A ICR Tier 1 - Small <100
MINTAGE

Landscape Varieties [Canadian]:

Our study of Canadian 5oz weight class pieces included several hundred examples and was conclusive enough to justify the presentation of six [6] series of ingot and only one [1] commercial bar series.  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.

EXAMPLE HALLMARK OBVERSE REVERSE COMMENTARY SAMPLE
SERIAL
NUMBERS
ICR | MINTAGE
5 bull copy 2FullSizeRender
Mid Hallmark [999+]  [5.000]  [Bull Hallmark in Elongated Octagon]  [Serial Number] Cast Finish 1st series Canadian ingot in 5-digit serial variation.  This ingot’s 5-digit serial format, placement of weight/purity stampings and casting dimension are familiar to its 3rd 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.  Based on this ingot’s dimension, we speculate Canada was initially provided with casting moulds used by the United States at that time for the first three series of Canadian ingots.  Ingot 89344 sold via eBay on March 11, 2016 for $809.00. 89316
89344
ICR Tier 1 - Small <50
MINTAGE
93195 5oz bull Mid Hallmark [999+]  [5.000]  [Bull Hallmark in Elongated Octagon]  [Serial Number] Cast Finish 2nd series Canadian ingot in 5-digit serial variation.  This ingot shares 1st series hallmark and 5-digit serial format but the weight and purity stampings are reversed.  Based on this ingot’s dimension, we speculate Canada was initially provided with casting moulds used by the United States at that time for the first three series of Canadian ingots.   89309
89347
93195
96846
ICR Tier 1 - Small <500
MINTAGE
5oz AG - 114998
Screenshot_20170505-122711
Mid Hallmark [999+]  [5.000]  [Bull Hallmark in Elongated Octagon]  [Serial Number] Cast Finish 3rd series Canadian ingot in 6-digit serial variation. This ingot includes a hallmark stamp unique to 1st and 2nd series ingots.  Based on this ingot’s dimension, we speculate Canada was initially provided with casting moulds used by the United States at that time for the first three series of Canadian ingots.  We have observed examples with both United States and Canadian serial number fonts in this series and believe the serial numbers were assigned with specific prefix for each run.  We also believe there was not a continuous production run for the entire range of serial numbers. Note the variations in spacing between purity and weight stamps.  The variety with wider spacing is more commonly observed than the variety with narrow spacing. Photos of both are provided. 110052
114998
115931
116455
116994
122174
126259
146352
146558
167590
171396
171538
171578
171607
ICR Tier 2 - Small<5,000
MINTAGE
Screen Shot 2017-05-01 at 9.40.11 AM
Mid Hallmark[999+]  [5.000]  [Bull Hallmark in Elongated Octagon]  [Serial Number]Cast Finish3rd series Canadian ingot in large 6-digit serial variation.  We believe this was a relatively intermittent serial serial run from 152200 to 152799 and a narrow range at around 168668.152217
152300
152366
152385
152514
152714
152767
168668
ICR Tier 1 - Small<500
MINTAGE
image1image1 2Mid Hallmark[999+]  [5•000]  [Bull Hallmark in Elongated Octagon]  [Serial Number]Cast Finish4th series ingot in Canadian variation.  First Canadian variety to include the ‘floating decimal’ on weight class and oddly demonstrates the purity font of 5th series United States ingot.  Serial number font common to 1st series Canadian examples, very unique and rare ingot. Our thanks to Damien M. for this find!98010
98012
ICR Tier 1 - Small<25
MINTAGE
photo 2-2 copyIMG_5397 copy Mid Hallmark [999+]  [5•000]  [Bull Hallmark in Elongated Octagon]  [Serial Number] Cast Finish
5th series ingot in Canadian variation.  First Canadian variety to include the new font for purity 9’s common to subsequent Canadian production.  United States serial number font was still being applied on most examples studied.  Based on this ingot’s dimension, we speculate Canada was initially provided with casting moulds used by the United States at that time for the first three series of Canadian ingots.  Ingot 193191 sold privately on April 1, 2017 for $1,000.00.
171668
171679
171906
193191
215797
ICR Tier 1 - Small <50
MINTAGE
Screen Shot 2014-03-17 at 9.39.24 AMIMG_4382 copy

Mid Hallmark  [999+]  [5•000]  [Bull Hallmark in Elongated Octagon]  [Serial Number]   Cast Finish 6th series ingot in Canadian variation.  We believe this series ingot to be the first truly ‘All Canadian’ 5oz variety.  Features a casting mould, font set, and stamp placement unique to only Canadian examples.  Serial font is larger and uniquely Canadian, specifically the number ‘1’ has a horizontal bar at the top and does not angle down as seen on US font set.  Also unique are the fully-curved ‘3’ numbers vs. the United States serial font.  We believe these pieces were produced in two runs, specifically prefix ‘135’ and ‘193’ both pictured.  Ingots 135690 and 193071 sold privately on April 1, 2017 for $850.00 each. 135690
135741
193013
193044
193057
193059
193071

ICR Tier 1 - Small <150
MINTAGE
photo 1-12 copyIMG_4389 copy
5.00oz CANADIAN 2363775oz-248574
FullSizeRender
Mid Hallmark [999+]  [5•000]  [Bull Hallmark in Elongated Octagon]  [Serial Number] Cast Finish 7th series ingot in Canadian variation.  Some examples observed with casting striations on the reverse familiar to other Canadian weight class, pictured.  Also pictured is an example with serial number and casting finish unique to this series. 195762
201139
203276
214351
215348
215581
235560
235646
236377
236673
235949
239762
240068
242783
247990
248574
248763
ICR Tier 3 - Small <7,500
MINTAGE
Screen Shot 2017-08-17 at 9.26.44 AMMid Hallmark[999+]  [5•000]  [Bull Hallmark in Elongated Octagon]  [Serial Number]Cast Finish
7th series ingot in Canadian variation.  These examples demonstrate a ‘1•’ serial number prefix, such as the 1•212925 bar pictured, which was applied to eliminate inadvertent duplication of serial numbers. Note the unique reverse pattern on example 1•212895.  Ingot 1•213057 sold privately on October 2, 2017 for $1,000.00.
1•212895
1•212925
1•213029
1•213041
1•213052
1•213056
1•213057
ICR Tier 1 - Small<300
MINTAGE

[Included
in 7,500 estimate,
above]
IMG_4040 Mid Hallmark [999+]  [5•000]  [Bull Hallmark in Elongated Octagon]  [Serial Number] Smooth Machined Finish 8th series machined bar in Canadian variation, last known variety produced. 219818
219837
ICR Tier 1 - Small <200
MINTAGE

Serial Number Reference:
 Prefix  Name
  No Prefix
  5-Digit, Landscape Variety, Top Hallmark, 5.000, Non ‘+’ Variety, Poured Ingot
  5-Digit, Landscape Variety, Top Hallmark, 5.000, Poured Ingot
  5-Digit, Landscape Variety, Mid Hallmark, 5.000, Poured Ingot
  5-Digit, Landscape Variety, Mid Hallmark, 5.000, MFR Variation, Poured Ingot
  4-Digit, Landscape Variety, Mid Hallmark, 5.000, Poured Ingot
  5-Digit, Landscape Variety, Large Mid Hallmark, 5.000, Poured Ingot
  5-Digit, Landscape Variety, Mid Hallmark, 5.ooo [Small Trailing Zeros], Poured Ingot
  6-Digit, Landscape Variety, Mid Hallmark, 5.ooo [Small Trailing Zeros], Leading Zero Prefix, Poured Ingot
  5-Digit, Landscape Variety, Mid Hallmark, 5 T.OZ [999+ FINE SILVER], Poured Ingot
  6-Digit, Landscape Variety, Mid Hallmark, 5 T.OZ [999+ FINE SILVER], Leading Zero Prefix, Poured Ingot
  6-Digit, Portrait Variety, Maple Leaf Hallmark, Machined bar
  A
  4-Digit, Portrait Variety, Liberty Trade Hallmark, Machined Bar
  P   6-Digit, Landscape Variety, Mid Hallmark, Machined Bar
  C   C Series, Landscape Variety, Top Hallmark, Machined Bar
  Canadian No Prefix   5-Digit, Landscape Variety, Bull Hallmark, Series 1, Poured Ingot
  6-Digit, Landscape Variety, Bull Hallmark, Series 2, Poured Ingot
  6-Digit, Landscape Variety, Bull Hallmark, Series 3, Poured Ingot
  6-Digit, Landscape Variety, Bull Hallmark, Series 4, Poured Ingot
  6-Digit, Landscape Variety, Bull Hallmark, Series 5, Poured Ingot
  6-Digit, Landscape Variety, Bull Hallmark, Series 6, Poured Ingot
  6-Digit, Landscape Variety, Bull Hallmark, Series 7, Machined Bar

  • Most Engelhard 5oz class silver bars have serial numbers.  Exceptions include Australian examples and seldom seen serial absent variety, believe to be an error piece.
  • We believe the crudely finished top hallmark examples in non ‘+’ format was the first 5oz ingot produced.
  • Serial number range for United States pieces in 5-digit and 6-digit serial format appears to span from 00001 to 90000 with several design changes and of course overflow serial numbers on some examples.
  • The 6-digit variety with ‘zero’ prefix were produced after the majority of 5-digit pieces and do include some overlap of some simultaneously produced 5-digit pieces.
  • The letter prefix ‘P’ series and ‘C’ series were produced after the 6-digit non-letter prefix United States examples and in that order.
  • 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 would not have had the foresight to designate a ‘P’ prefix in anticipation of the ‘C’ prefix series as the advancement of production technology was not foreseeable when they designated the ‘P’ prefix.