ALL ENGELHARD is pleased to welcome visitors to our Johnson Matthey 20oz and 25oz 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 |
 | 20oz | [Diamond JM Logo with Crossed Hammers] [20 OZ] [Serial Number] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 20oz example produced by Johnson Matthey, Canada. Considerably rare ingot, as most are believed to have been melted down during the ‘Great Melt’ period of the 1980’s. | 12062A | <500 |
 | 20oz | [Diamond JM Logo with Crossed Hammers] [20 OZ] [Serial Number] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 20oz example produced by Johnson Matthey, Canada. Similar to our above example, though demonstrates a letter ‘F’ serial suffix. | 02136F 02362F 02543F 02925F 02926F 02985F 03047F 03060F 03076F | <500 |
 | 20oz | [Diamond JM Logo with Crossed Hammers] [20+ OZ] [Serial Number] [999+] [Number 8 Below Serial Number] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 20oz example produced by Johnson Matthey, Canada. Includes unique Number 8 stamp, similar to it’s 50+oz counterpart listed on the 5oz Johnson Matthey definitive page. | 1120 1329 | <50 |
 | 20oz | [Diamond JM Logo with Crossed Hammers] [20 OZ] [Serial Number Sideways on Right] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 20oz example produced by Johnson Matthey, Canada. | F003629 F006340 | <1,500 |
 | 20oz | [Diamond JM Logo with Crossed Hammers] [20 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 20oz example produced by Johnson Matthey, Canada. This ‘Small Diamond’ variety is considerably more rare than the ‘Large Diamond’ variety. | Serial Absent | <100 |
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20oz | [JOHNSON MATTHEY] [Diamond JM Logo with Crossed Hammers] [Serial Number Sideways on Left] [20 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish |
20oz example produced by Johnson Matthey, Canada. Some examples are observed with opposite placement of the serial number. Interesting to note that example F006352 demonstrates reverse stamp impression anomaly on the ingot’s reverse, pictured below. Although the serial number range for this 20oz variety suggests a significant production mintage, these examples are seldom available on public auction. |
F002719 F003752 F004218 F005269 F005334 F006352 F007052 F008096 |
<7,500 |
 | 20oz | [TD Bank Logo] [Serial Number Sideways on Left] [20 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 20oz example produced by Johnson Matthey, Canada, for TD Bank. | F008196 F008534 | <1,000 |
 | 20oz | [Diamond JM Logo with Crossed Hammers] [20 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 20oz example produced by Johnson Matthey, Canada. Serial absent variation with ‘Large Diamond’ hallmark. | Serial Absent | <1,000 |
 | 20oz | [Diamond JM Logo with Crossed Hammers] [20 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Pressed Finish | 20oz example produced by Johnson Matthey, Canada. Unique example in that the stampings have been applied to the flat reverse side. | Serial Absent | <750 |
 | 20oz | [Diamond JM Logo with Crossed Hammers] [20 OZ] [CANADA Inner Oval] [JM LTD. ASSAY OFFICE Oval Logo] [999+] | Cast Finish | 20oz example produced by Johnson Matthey, Canada. Serial absent variation. Note the opposite placement of purity and assay stampings as opposed to our bar, above. | Serial Absent | <500 |
 | 20oz | [Diamond JM Logo with Crossed Hammers] [20 OZ.TR] [CANADA Inner Oval] [JM LTD. ASSAY OFFICE Oval Logo] [999+] | Cast Finish | 20oz example produced by Johnson Matthey, Canada. Serial absent variation and OZ.TR weight suffix. | Serial Absent | <250 |
 | 20oz | [Diamond JM Logo with Crossed Hammers] [20 OZ.TR] [999+] [CANADA Inner Oval] [JM LTD. ASSAY OFFICE Oval Logo] | Cast Finish | 20oz example produced by Johnson Matthey, Canada. Similar to our above example but demonstrates reverse placement of purity and oval logo. | Serial Absent | <25 |
 | 20oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [20 OZ.TR] [999] [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 20oz example produced by Johnson Matthey & Mallory, Canada. Unique placement of weight class designation and purity stamp lacks the ‘+’ on 999 fineness. | Serial Absent | <25 |
 | 20oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] [20 OZ.TR] | Cast Finish | 20oz example produced by Johnson Matthey & Mallory, Canada. Note the spectacular cooling lines and toning on the example pictured. | Serial Absent | <250 |
 | 20oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [Maple Leaf Logo] [999+] [20 OZ.TR] | Cast Finish | 20 oz example produced by Johnson Matthey & Mallory, Canada. Similar to the above example but lacking the second smaller oval JM&M hallmark. | Serial Absent | <25 |
 |
20oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [Maple Leaf Logo] [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] [20 OZ.TR] | Cast Finish |
20oz example produced by Johnson Matthey & Mallory, Canada. This example is more of a ‘pudgy’ shape than the one listed above and also demonstrates a different oval hallmark and includes the Maple Leaf logo. Other varieties are flatter and wider/longer than this unique ingot. | Serial Absent | <25 |
 | 20oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] [20 OZ.TR] | Cast Finish | Similar to our ‘pudgy’ example above example but does not include the Maple Leaf logo. Other varieties are flatter and wider/longer than this unique ingot. | Serial Absent | <25 |
 | 10oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [J M & M LTD. ASSAY OFFICE Oval Logo] [20 OZ.TR] [999+] | Cat Finish | Similar to our two ‘pudgy’ examples above example but does not include the Maple Leaf logo or the smaller oval hallmark. Other varieties are flatter and wider/longer than this unique ingot. Sales record of the only known example reflects purchase price of $1,398.42 on May 23, 2017. | Serial Absent | <25 |
 | 20oz | [JMC Rectangular Logo] [999+] [20oz.TR] | Cast Finish | 20oz example produced by Johnson Matthey & Mallory, Canada. Only known variety of JMC ingot to have been cast from the same size mould as our three ‘pudgy’ JM&M portrait examples listed above. | Serial Absent | <100 |
 | 20oz | [JOHNSON MATTHEY LONDON Oval Logo] [REFINERS MELTERS Inner Oval] [999] [20 OZS] | Cast Finish | 20oz example produced by Johnson Matthey London. At least one known example demonstrates a waffle finish on the reverse, pictured below. | Serial Absent | <500 |
 | 25oz | [Diamond JM Logo with Crossed Hammers] [25 OZ] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] | Cast Finish | 25oz example produced by Johnson Matthey, Canada. Large weight class designation font, earliest known variety. | Serial Absent | <25 |
 |
25oz | [Diamond JM Logo with Crossed Hammers] [25 OZ] [Serial Number] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish |
25oz example produced by Johnson Matthey, Canada. | 20017E | <25 |
 | 25oz | Diamond JM Logo with Crossed Hammers] [25 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 25oz example produced by Johnson Matthey, Canada. Serial absent variation of our example above. | Serial Absent | <25 |
 | 25oz | Diamond JM Logo with Crossed Hammers] [25 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 25oz example produced by Johnson Matthey, Canada. Serial absent variation of our example above with font anomaly on weight stamp. Notice the smaller ‘5’ in the ’25oz’ weight class designation. | Serial Absent | <25 |