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.
| IMAGE | WEIGHT CLASS | OBVERSE | REVERSE | COMMENTARY | SAMPLE SERIAL NUMBERS | ESTIMATED MINTAGE |
 | 100oz | [SIMMONS REFCO METALS Custom Logo] [REFCO METALS] [999+] [100 OUNCES TROY] [A000596] [ASSAYERS] [Small SIMMONS REFCO METALS Custom Logo] [REFINERS] | Cast Finish | 100oz example produced by Johnson Matthey, United States, for Simmons Refco Metals. | A000596 A000985 | <200 |
 | 100oz | [Diamond JM Logo with Crossed Hammers] [100+ OZ] [999+] [JM L. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 100oz example in serial absent variety produced by Johnson Matthey, Canada. | Serial Absent | 10,000 |
 | 100oz | [Diamond JM Logo with Crossed Hammers] [100+ OZ] [JM L. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]. [999+] | Cast Finish | 100oz 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! | Serial Absent | <100 |
 | 100oz | [Diamond JM Logo with Crossed Hammers] [100+ OZ] [Serial Number] [999+] [JM L. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 100oz example in four-digit serial number format produced by Johnson Matthey, Canada. | 5020 | <200 |
 | 100oz | [Diamond JM Logo with Crossed Hammers] [100+ OZ] [Serial Number] [999+] [JM L. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 100oz example produced by Johnson Matthey, Canada. | 10045 B 10446 B | <500 |
 | 100oz | [Diamond JM Logo with Crossed Hammers] [100+ OZ] [999+] [Serial Number] [JM L. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 100oz 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 |
 | 100oz | [Diamond JM Logo with Crossed Hammers] [100+ OZ] [Serial Number] [999+] [JM L. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 100oz example produced by Johnson Matthey, Canada. | 12784 A 17520 A | <5,000 |
 | 100oz | [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 Finish | 100oz example produced by Johnson Matthey, Canada. Occasionally seen with alternate placement of the ‘8’ stamp. | 2175 3762 | <2,500 |
 | 100oz | [Diamond JM Logo with Crossed Hammers] [Number 8 Below Diamond Logo] [Maple Leaf Logo] [Serial Number Sideways on Left] [999+] [100+ OZ] | Cast Finish | 100oz 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 | [BACHE Logo] [100+ OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 100oz example produced by Johnson Matthey, Canada, for BACHE. | Serial Absent | <500 |
 | 100oz | [BACHE Logo] [100+ OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 100oz 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 |
 | 100oz | [Diamond JM Logo with Crossed Hammers] [Serial Number Sideways on Right] [100+ OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 100oz example produced by Johnson Matthey, Canada. | 000340 | <250 |
 | 100oz | [Diamond JM Logo with Crossed Hammers] [Serial Number Sideways on left] [100+ OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 100oz example produced by Johnson Matthey, Canada. | 000257 | <250 |
 | 100oz | [Diamond JM Logo with Crossed Hammers] [Serial Number Sideways on Right] [100+ OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 100oz example produced by Johnson Matthey, Canada. | A022873 A022935 A030295 | <2,000 |
 | 100oz | [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 Finish | 100oz 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. | A022006 | <50 |
 | 100oz | [TD Bank Logo] [Serial Number Sideways on Right] [100+OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 1st 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 |
 | 100oz | [TD Bank Logo] [Serial Number Sideways on Left] [100 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 2nd series 100oz example produced by Johnson Matthey, Canada, for TD Bank. | A227909 | <500 |
 | 100oz | [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 Finish | 100oz example produced by Johnson Matthey, Canada, for Westway. | A024601 | <100 |
 | 100oz | [Swiss Bank Corporation Logo] [Serial Number Sideways on Left] [100 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 100oz example produced by Johnson Matthey, Canada, for Swiss Bank Corporation. | A236624 | <100 |
 | 100oz | [Diamond JM Logo with Crossed Hammers] [100+ OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 100oz 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 | [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 Finish | 100oz example produced by Johnson Matthey, Canada, for Westway. | A031984 | <500 |
 | 100oz | [Westway Counterstamp] [Small Diamond JM Logo with Crossed Hammers] [100+OZ] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] | Cast Finish | 100oz example produced by Johnson Matthey, Canada, for Westway in serial absent variation. | Serial Absent | <100 |
 | 100z | [Westway Counterstamp] [Small Diamond JM Logo with Crossed Hammers] [100+OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 100oz 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 |
 | 100oz | [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 Finish | 100oz example produced by Johnson Matthey & Mallory, Canada. | 45164 | <1,000 |
 | 100oz | [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 Finish | 100oz example produced by Johnson Matthey & Mallory, Canada. | Serial Absent | <500 |
 | 100oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [Maple Leaf Logo] [999+] [100+OZ] | Cast Finish | 100oz 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 |
 | 100oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [Maple Leaf Logo] [999+] [100+OZ] | Cast Finish | 100oz 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 | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] [100+OZ] | Cast Finish | 100oz example produced by Johnson Matthey & Mallory, Canada. Maple Leaf logo absent variation of our above example. | Serial Absent | <1,000 |
 | 100oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [100+OZ] [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] | Cast Finish | 100oz example produced by Johnson Matthey & Mallory, Canada. | Serial Absent | <500 |
 | 100oz | [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 Finish | 100oz example produced by Johnson Matthey & Mallory, Canada. | 0483 | <250 |
 | 100oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [999+] [100+OZ] | Cast Finish | 100oz example produced by Johnson Matthey & Mallory, Canada. Maple Leaf logo and small Assay Office oval absent variation of our above examples. | Serial Absent | <50 |
  | 100oz | [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 Finish | 100oz 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.  At least one example, ingot A326698, demonstrates a mirror image weight class stamp on the reverse, pictured below. | 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 |
 | 100oz | [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 Finish | 100oz 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.  | A111776 | <25 |
 | 100oz | [JOHNSON MATTHEY] [Diamond JM Logo with Crossed Hammers] [100+ OZ] [Serial Number] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] | Cast Finish | 100oz 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 |
 | 100oz | [Mocatta Metals Corporation Logo] [100+ OZ] [Serial Number] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 100oz 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. | M24501 M26026 M28514 M028941 | <5,000 |
 | 100oz | [JOHNSON MATTHEY] [Diamond JM Logo with Crossed Hammers] [100 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 100oz example produced by Johnson Matthey, Canada. Note the lack of a ‘+’ purity designation suffix. | Serial Absent | <10,000 |
 | 100oz | [JOHNSON MATTHEY] [Diamond JM Logo with Crossed Hammers] [100 OZ] [999+] [J&M ASSAY OFFICE Oval Logo] [SLC Inner Oval] | Cast Finish | 100oz 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 |
 | 100oz | [JOHNSON MATTHEY] [Diamond JM Logo with Crossed Hammers] [Serial Number] [100 OZ] [999+] [J&M ASSAY OFFICE Oval Logo] [SLC Inner Oval] | Cast Finish | 100oz example produced by Johnson Matthey, circa 2006 production. Similar to our above example, though includes serial number assignment. | 006576 006575 | <10,000 |
 | 100oz | [JOHNSON MATTHEY LONDON Oval Logo] [REFINERS MELTERS Inner Oval] [999.0] [Serial Number] [100 OZS.T.] | Cast Finish | 100oz example produced by Johnson Matthey, London. | 00003 | <25 |
 | 100oz | [JOHNSON MATTHEY LONDON Oval Logo] [REFINERS MELTERS Inner Oval] [100 OZS] [SILVER] [Serial Number] | Cast Finish | 100oz 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.     | 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 |
 | 100oz | [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.  | R01041 R02315 R03698 R3808C R11157 R28947 R44684 R45267 R47357 R54182 R56249 R69011 R77354 R78446 R90710 R92593 R93337 R94088 R94449 | <100,000 |
 | 100oz | [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. | 2163 B2546 | <3,000 |