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AG | 20oz | 25oz

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
image20oz[Diamond JM Logo with Crossed Hammers] [20 OZ] [Serial Number] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish20oz 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.  02136F
02362F
02543F
02925F
02926F
02985F
03047F
03060F
03076F
<500
unnamed20oz[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 Finish20oz 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
image20oz[Diamond JM Logo with Crossed Hammers] [20 OZ] [Serial Number Sideways on Right] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish20oz example produced by Johnson Matthey, Canada.F003629
F006340
<1,500
unnamed-120oz[Diamond JM Logo with Crossed Hammers] [20 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish20oz example produced by Johnson Matthey, Canada.  This ‘Small Diamond’ variety is considerably more rare than the ‘Large Diamond’ variety.Serial Absent<100
JM 20oz 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.  Although the serial number range for this 20oz variety suggests a significant production mintage, these examples are seldom available on public auction.
unnamed
F002719
F003752
F004218
F005269
F006352
F007052
F008096
<7,500
JM_20Oz_TDBankObv20oz[TD Bank Logo] [Serial Number Sideways on Left] [20 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish20oz example produced by Johnson Matthey, Canada, for TD Bank.
F008196
F008534
<1,000
unnamed20oz[Diamond JM Logo with Crossed Hammers] [20 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish20oz example produced by Johnson Matthey, Canada. Serial absent variation with ‘Large Diamond’ hallmark.Serial Absent<1,000
unnamed20oz[Diamond JM Logo with Crossed Hammers] [20 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Pressed Finish20oz example produced by Johnson Matthey, Canada.  Unique example in that the stampings have been applied to the flat reverse side.Serial Absent<750
image20oz[Diamond JM Logo with Crossed Hammers] [20 OZ] [CANADA Inner Oval] [JM LTD. ASSAY OFFICE Oval Logo] [999+]Cast Finish20oz 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
unnamed-120oz[Diamond JM Logo with Crossed Hammers] [20 OZ.TR] [CANADA Inner Oval] [JM LTD. ASSAY OFFICE Oval Logo] [999+]Cast Finish20oz example produced by Johnson Matthey, Canada. Serial absent variation and OZ.TR weight suffix.Serial Absent<250
image20oz[Diamond JM Logo with Crossed Hammers] [20 OZ.TR] [999+] [CANADA Inner Oval] [JM LTD. ASSAY OFFICE Oval Logo]Cast Finish20oz example produced by Johnson Matthey, Canada. Similar to our above example but demonstrates reverse placement of purity and oval logo.  One known example.Serial Absent<25
unnamed20oz[JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [20 OZ.TR] [999] [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish20oz 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<25
image20oz[JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] [20 OZ.TR]Cast Finish20oz example produced by Johnson Matthey & Mallory, Canada.  Note the spectacular cooling lines and toning on the example pictured.Serial Absent<250
image20oz[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. One known example.
Serial Absent<25
JM_20Oz_PouredNoSerialObv 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.  One known example. Serial Absent <25
unnamed20oz[JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] [20 OZ.TR]Cast FinishSimilar 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.  One known example.Serial Absent<25
image10oz[JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [J M & M LTD. ASSAY OFFICE Oval Logo] [20 OZ.TR] [999+]Cat FinishSimilar 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
image20oz[JMC Rectangular Logo] [999+] [20oz.TR]Cast Finish20oz 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
JM 20oz LONDON20oz[JOHNSON MATTHEY LONDON Oval Logo] [REFINERS MELTERS Inner Oval] [999] [20 OZS]
Cast Finish20oz example produced by Johnson Matthey London.  One known example demonstrates a waffle finish on the reverse, pictured below.
Screen Shot 2017-10-20 at 12.53.01 PM
Serial Absent<500
admin-ajax.php25oz[Diamond JM Logo with Crossed Hammers] [25 OZ] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+]Cast Finish25oz example produced by Johnson Matthey, Canada.  Large weight class designation font, earliest known variety.Serial Absent<25
JM_25Oz_StandardObv 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
image25ozDiamond JM Logo with Crossed Hammers] [25 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish25oz example produced by Johnson Matthey, Canada. Serial absent variation of our example above.
Serial Absent<25
image25ozDiamond JM Logo with Crossed Hammers] [25 OZ] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval]Cast Finish25oz 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