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AG | 100oz


ALL ENGELHARD is pleased to welcome visitors to our Johnson Matthey 100oz Definitive Page. While our focus is clearly Engelhard, we recognize that many Engelhard bullion collectors also collect Johnson Matthey bars and ingots. As such, we appreciate the opportunity to present important bullion information on the world’s second most collectible refiner, Johnson Matthey. We hope you welcome this new addition, and we look forward to your thoughts and input!

Our Definitives, below, are organized region of origin.  Also note that our Definitives reflect what we believe to be the earliest examples first, followed by more recent production examples. 

IMAGEWEIGHT CLASS
OBVERSEREVERSECOMMENTARYSAMPLE
SERIAL
NUMBERS		ESTIMATED MINTAGE
IMG_8649100oz[SIMMONS REFCO METALS Custom Logo] [REFCO METALS] [999+] [100 OUNCES TROY] [A000596] [ASSAYERS] [Small SIMMONS REFCO METALS Custom Logo] [REFINERS]Cast Finish100oz example produced by Johnson Matthey, United States, for Simmons Refco Metals.A000596
A000985		<200
0100oz[Diamond JM Logo with Crossed Hammers] [100+ OZ] [999+] [JM L. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example in serial absent variety produced by Johnson Matthey, Canada.Serial Absent10,000
Screen Shot 2023-08-07 at 2.09.30 PM100oz[Diamond JM Logo with Crossed Hammers] [100+ OZ] [JM L. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]. [999+] Cast Finish100oz example in serial absent variety produced by Johnson Matthey, Canada.  Similar to our example above, though produced from the casting mould of  its 50oz counterpart, pictured below.  Our thanks to Thomas F. and Dan S. for this discovery!
Screen-Shot-2019-02-27-at-9.27.10-AM		Serial
Absent		<100
image2100oz[Diamond JM Logo with Crossed Hammers] [100+ OZ] [Serial Number] [999+] [JM L. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example in four-digit serial number format produced by Johnson Matthey, Canada.5020<200
IMG_6519100oz[Diamond JM Logo with Crossed Hammers] [100+ OZ] [Serial Number] [999+] [JM L. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada.10045 B
10446 B		<500
Screen Shot 2021-08-04 at 10.12.33 AM100oz[Diamond JM Logo with Crossed Hammers] [100+ OZ] [999+] [Serial Number] [JM L. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada.  Similar to our above example, though demonstrates a wider purity stamp spacing and serial/weight stamp placement variation.12797 B<500
IMG_8662100oz[Diamond JM Logo with Crossed Hammers] [100+ OZ] [Serial Number] [999+] [JM L. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada.
12784 A
17520 A		<5,000
JM 100oz 8 Ball100oz[Diamond JM Logo with Crossed Hammers] [Number 8 Below Diamond Logo] [100+ OZ] [Serial Number Sideways on Left] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada.  Occasionally seen with alternate placement of the ‘8’ stamp.2175
3762		<2,500
IMG_8932100oz[Diamond JM Logo with Crossed Hammers] [Number 8 Below Diamond Logo] [Maple Leaf Logo] [Serial Number Sideways on Left] [999+] [100+ OZ] Cast Finish100oz example produced by Johnson Matthey, Canada.  Similar to our above example, though this variety includes the Maple Leaf Logo and lacks the smaller JM LTD. ASSAY OFFICE Oval Logo.3938<100
100OZ JM BACHE 2100oz[BACHE Logo] [100+ OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada, for BACHE.
Serial Absent<500
100OZ JM BACHE 1100oz[BACHE Logo] [100+ OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada, for BACHE.  Note the ‘+’ weigh class designation suffix.  Purity and oval logo variation of our example above.
Serial Absent<500
IMG_3996100oz[Diamond JM Logo with Crossed Hammers] [Serial Number Sideways on Right] [100+ OZ] [999+]  [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada.000340<250
IMG_3997100oz[Diamond JM Logo with Crossed Hammers] [Serial Number Sideways on left] [100+ OZ] [999+]  [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada.000257<250
31FE34B4-7EFE-49DA-B857-E606B3182E96_1_105_c100oz[Diamond JM Logo with Crossed Hammers] [Serial Number Sideways on Right] [100+ OZ] [999+]  [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada.
A022873
A022935
A030295		<2,000
unnamed-1100oz[Diamond JM Logo with Crossed Hammers] [C. Rhyne & Assoc. SEATTLE, WA Custom Hallmark in Elongated Octagon] [999+FINE] [Serial Number Sideways on Right] [100+ OZ] [999+]  [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada.  Similar to our example above, this ingot demonstrates a C. Rhyne & Associates counterstamp.  C. Rhyne & Associates entered the gold and silver market in 1974, opening in Tacoma, Washington.  They later relocated to Seattle, Washington, until ending operations in 1996.
unnamed-2		A022006<50
Screen Shot 2017-03-20 at 11.31.57 AM100oz[TD Bank Logo] [Serial Number Sideways on Right] [100+OZ] [999+]  [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish1st series 100oz example produced by Johnson Matthey, Canada, for TD Bank.  This ingot demonstrates a much narrower and deeper casting mould than the 2nd series, defined below.M000187
M000326		<250
JM 100oz TD Bank100oz[TD Bank Logo] [Serial Number Sideways on Left] [100 OZ] [999+]  [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish2nd series 100oz example produced by Johnson Matthey, Canada, for TD Bank.

A148726
A227746
A227909
A227989
A250905

<500
6F329CF5-D9F1-4E38-9345-23F823EF3CA2_1_105_c100oz[TD Bank Logo] [Serial Number Sideways on Left] [100 OZ] [999+]  [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish2nd series 100oz example produced by Johnson Matthey, Canada, for TD Bank.  Similar to our example above, though of a more square casting mould as demonstrated in approximate serial number run A148751 to A148926.  Photo below for comparative purposes.
6F329CF5-D9F1-4E38-9345-23F823EF3CA2_1_105_c-2

A148751
A148926

<150
s-l1600100oz[Westway Logo] [Diamond JM Logo with Crossed Hammers] [Serial Number Sideways on Right] [100+OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada, for Westway.A024601<100
JM 100oz SNB100oz[Swiss Bank Corporation Logo] [Serial Number Sideways on Left] [100 OZ] [999+]  [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada, for Swiss Bank Corporation. A236624<100
100-Ounce (oz) Johnson Matthey Silver Bar, Poured, No Serial Number, Obverse100oz[Diamond JM Logo with Crossed Hammers] [100+ OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada.  Note the ‘+’ weigh class designation suffix.  Pppears  some 100 oz bars in serial absent variation demonstrate ‘ 100+ OZ’ weight class designation slightly above middle of the bar, whereas bars with  serial numbers have ‘100+ OZ’ line near bottom, just above ‘999+’ line.Serial Absent<50,000
100oz JM Westway100oz[Westway Counterstamp] [Small Diamond JM Logo with Crossed Hammers] [Serial Number Sideways on Right] [100+OZ]  [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada, for Westway.A031984<500
JM 100oz Westway Serial Absent100oz[Westway Counterstamp] [Small Diamond JM Logo with Crossed Hammers] [100+OZ] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+]Cast Finish100oz example produced by Johnson Matthey, Canada, for Westway in serial absent variation.
Serial Absent<100
image_67180801100z[Westway Counterstamp] [Small Diamond JM Logo with Crossed Hammers] [100+OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada, for Westway in serial absent variation.  Similar to our above example, though demonstrates variation of purity stamp placement.Serial
Absent		<100
JM 100oz JMM Serial Present100oz[JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [Maple Leaf Logo] [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [Serial Number] [999+] [100+OZ]Cast Finish100oz example produced by Johnson Matthey & Mallory, Canada.45164<1,000
JM_UISB_100Oz_15924_Obv100oz[JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [Maple Leaf Logo] [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] [100+OZ]Cast Finish100oz example produced by Johnson Matthey & Mallory, Canada.
Serial Absent<500
Screen Shot 2017-03-20 at 11.48.48 AM100oz[JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [Maple Leaf Logo] [999+] [100+OZ]Cast Finish100oz example produced by Johnson Matthey & Mallory, Canada.  This variation lacks the smaller JM&M oval stamp at the bottom of the obverse.Serial Absent<500
100 oz JM front100oz[JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [Maple Leaf Logo] [999+] [100+OZ]Cast Finish100oz example produced by Johnson Matthey & Mallory, Canada.  Similar to our example above, though includes a larger ‘100+OZ’ weight class font.Serial
Absent		<50
100OZ JMM 1100oz[JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] [100+OZ]Cast Finish100oz example produced by Johnson Matthey & Mallory, Canada.  Maple Leaf logo absent variation of our above example.
Serial Absent<1,000
IMG_7242100oz[JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [100+OZ] [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] Cast Finish100oz example produced by Johnson Matthey & Mallory, Canada.  Serial Absent<500
unnamed100oz[JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] [100+OZ] [Serial Number]Cast Finish100oz example produced by Johnson Matthey & Mallory, Canada. 0483<250
IMG_0189100oz[JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [999+] [100+OZ]Cast Finish100oz example produced by Johnson Matthey & Mallory, Canada.  Maple Leaf logo and small Assay Office oval absent variation of our above examples.Serial Absent<50
jm-100oz-silver-barunnamed100oz[JOHNSON MATTHEY] [Diamond JM Logo with Crossed Hammers] [Serial Number Sideways on Left] [100+ OZ]  [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada. Some variations on serial number placement have been observed, as pictured.  A narrow range of ingots between A271000 and A279999 have been observed to be lacking the ‘+’ after the 100oz weight stamp, pictured below.  
1-3At least one example, ingot A326698, demonstrates a mirror image weight class stamp on the reverse, pictured below.
0		004810
006779
009883
014181
A1469
A033604
A044079
A093759
A103239
A123043
A136577
A138912
A146878
A172480
A213970
A220895
A259168
A271183
A279531
A332530
A357988
A396248
A439696		<500,000
image2-5100oz[JOHNSON MATTHEY] [Diamond JM Logo with Crossed Hammers] [Serial Number Sideways on Left] [100+ OZ]  [999+] [JMRI. ASSAY OFFICE Oval Logo] [USA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada.  Similar to our above example, though demonstrates a unique ‘USA’ smaller oval hallmark at the bottom vs. the standard ‘JM LTD. ASSAY OFFICE’ as seen above.  Also note the serial number stamping anomaly, also pictured below.
image4
image5		A108869
A108871
A111776		<1,000
FullSizeRender100oz[JOHNSON MATTHEY] [Diamond JM Logo with Crossed Hammers] [100+ OZ] [Serial Number] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] Cast Finish100oz example produced by Johnson Matthey, Canada.  Interesting example, in that the weight designation placement is that of earlier pieces.  The serial number designation and placement are further anomalies.13438 B
13498 B
13502 B		<100
Screen Shot 2018-04-06 at 2.59.46 PM100oz[Mocatta Metals Corporation Logo] [100+ OZ] [Serial Number] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]
Cast Finish100oz example produced by Johnson Matthey, Canada, for Mocatta Metals Corporation.  Larger presentation of Mocatta Metals Corporation logo shown below.  One known example demonstrates vertical serial number placement variation, also pictured, and includes a leading zero after the letter ‘M’ prefix.

36592_Obv		M24501
M26026
M28514
M028941		<5,000
Johnson-Matthey-Silver-Bar100oz[JOHNSON MATTHEY] [Diamond JM Logo with Crossed Hammers] [100 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish100oz example produced by Johnson Matthey, Canada.  Note the lack of a ‘+’ purity designation suffix. Serial Absent<10,000
image-4100oz[JOHNSON MATTHEY] [Diamond JM Logo with Crossed Hammers] [100 OZ] [999+] [J&M ASSAY OFFICE Oval Logo] [SLC Inner Oval]Cast Finish100oz example produced by Johnson Matthey, circa 2006 production.  Similar to our above example, though demonstrates an ‘SLC’ inner oval stamping which is representative of the Salt Lake City, Utah facility.Serial Absent<50,000
JM 100 1100oz[JOHNSON MATTHEY] [Diamond JM Logo with Crossed Hammers] [Serial Number] [100 OZ] [999+] [J&M ASSAY OFFICE Oval Logo] [SLC Inner Oval]Cast Finish100oz example produced by Johnson Matthey, circa 2006 production.  Similar to our above example, though includes serial number assignment.006576
006575		<10,000
Matt1100oz[JOHNSON MATTHEY LONDON Oval Logo] [REFINERS MELTERS Inner Oval] [999.0] [Serial Number] [100 OZS.T.] Cast Finish100oz example produced by Johnson Matthey, London.00003<25
dsc00826100oz[JOHNSON MATTHEY LONDON Oval Logo] [REFINERS MELTERS Inner Oval] [100 OZS] [SILVER] [Serial Number]Cast Finish100oz example produced by Johnson Matthey, London.  Note there is quite often a brilliant and very attractive casting finish to the poured JM London ingots of various weight class.  One of our visitors captured the beauty reflected in these pieces and was kind enough to forward them to us, and they’re just too good not to include below.
a JM London 100oz front b JM London 100oz CU detail back OLYMPUS DIGITAL CAMERA OLYMPUS DIGITAL CAMERA OLYMPUS DIGITAL CAMERA		JM 70908 A
JM 70949 A
JM 71266 A
JM 72155 A
JM 72358 A
JM 72700 A
JM 72812 A
JM 72832 A		<250
Screenshot 2024-09-17 at 11.30.17 AM100oz[JMC][JMC]100oz industrial plate bar example produced by Johnson Matthey, United States.  This example demonstrates a JMC hallmark at the bottom of the obverse and reverse  as shown below.
IMG_65021IMG_65002		Serial Absent<2,000
JM_100Oz_Stamped_R77354100oz[JM Crossed Hammers Logo] [JOHNSON MATTHEY] [ASSAYERS & REFINERS] [FINE SILVER 999] [100 OUNCES TROY] [Serial Number][JM Crossed Hammers Logo Repeated Four Full Times]100oz example produced by Johnson Matthey, United States.  Issued in cardboard box, pictured below.  Many examples demonstrate machining swirls on both sides.  Produced in the late 1980s.  We have observed and logged many examples with a ‘C’ serial number suffix throughout the initial 10,000 bars produced, as demonstrated in the photo below.
JM_100Oz_Stamped_R54182
1 3		R01041
R02315
R03698
R3808C
R11157
R28947
R44684
R45267
R47357
R54182
R56249
R69011
R77354
R78446
R90710
R92593
R93337
R94088
R94449		<100,000
Screen Shot 2015-08-26 at 12.08.29 PM100oz [Statue of Liberty] [LIBERTY][JM Crossed Hammers Logo Repeated] [FINE SILVER 100 TROY OUNCES] [SERIAL NUMBER] [© 1982 MTB UNITED STATES OF AMERICA] 100oz example produced by Johnson Matthey, United States, for Manfra, Tordella & Brookes. Originally issued in cardboard protective box, pictured below.
$_57-1
2163
B2546		<3,000
Screenshot 2024-05-23 at 12.57.08 PM100oz[GARANTITO] [DALLA] [METALLI PRIZIOSI S.p.A.] [PADERNO DUGNANO] [-MILANO-] [JOHNSON MATTHEY & CO. LTD +LONDON+] [CONSOCIATA ITALIANA] [-Ag999 0/00][MP Diamond Logo] [100 OZS TROY] [FINE SILVER] [999,0] [MADE IN ITALY]Serial Absent<100

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