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. | 02136F 02362F 02543F 02925F 02926F 03047F 03060F 03076F | <1,000 |
 | 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 | <100 |
 | 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 | <2,500 |
 | 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. | Serial Absent | <500 |
 |
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. Interesting to note that example F006352 demonstrated reverse stamp impression anomaly on the ingot’s reverse, pictured below. |
F002719 F003752 F004218 F005269 F006352 F007052 F008096 |
<10,000 |
 | 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. | Serial Absent | <500 |
 | 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 | <500 |
 | 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 | <500 |
 | 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 | <250 |
 | 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. Two known examples. | Serial Absent | <100 |
 | 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. | Serial Absent | <500 |
 |
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. Similar to our above example but demonstrates a different oval hallmark and includes the Maple Leaf logo. | Serial Absent | <200 |
 | 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 above example but does not include the Maple Leaf logo. One known example. | Serial Absent | <100 |
 | 20oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [Maple Leaf Logo] [999+] [20 OZ.TR] | Cast Finish | 20oz example produced by Johnson Matthey & Mallory, Canada. Similar to our above examples but lacks both the oval JM&M hallmark and the Maple Leaf logo. One known example. | Serial Absent | <25 |
 | 20oz | [JMC Rectangular Logo] [999+] [20oz.TR] | Cast Finish | 20oz example produced by Johnson Matthey & Mallory, Canada. | Serial Absent | <500 |
 | 20oz | [JOHNSON MATTHEY LONDON Oval Logo] [REFINERS MELTERS Inner Oval] [999] [20 OZS] | Cast Finish | 20oz example produced by Johnson Matthey London. | 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 | <100 |
 |
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 | <1,000 |
 | 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 | <500 |
 | 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 | <100 |