ALL ENGELHARD is pleased to welcome visitors to our Johnson Matthey 10oz 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 |
 | 10oz | [Diamond JM Logo with Crossed Hammers] [10 OZ] [999+] | Cast Finish | 10oz example produced by Johnson Matthey, United States. | Serial Absent | <2,000 |
 | 10oz | [Diamond JM Logo with Crossed Hammers] [10 OZ] [999+] | Cast Finish | 10oz example produced by Johnson Matthey, United States. Similar to our above example, though of a slightly larger surface area as seen in the comparison photo below. The more common bar on the left below is appx. 2 1/4″ tall x 1 1/4″ wide x 5/8″ thick. The larger example to the right is 2 1/2″ tall x 1 1/2″ wide x 1/2″ thick. | Serial Absent | <250 |
 | 10oz | [Diamond JM Logo with Crossed Hammers] [10 OZ] [999+] | Cast Finish | 10oz example produced by Johnson Matthey, United States. Produced using a different casting mold than our above example or, more probable, stampings were applied to reverse side of the bar which would have faced bottom of casting mold. Note smooth square finish. | Serial Absent | <1,000 |
 | 10oz | [Diamond JM Logo with Crossed Hammers] [10 OZ] [999+] [10 OZ] | Cast Finish | 10oz error example produced by Johnson Matthey, United States. Similar to our example above, though demonstrates and additional ’10 OZ’ weight stamping. | Serial Absent | <5 |
 | 10oz | [Diamond JM Logo with Crossed Hammers] [10 OZ] [999+] | Cast Finish | 10oz example produced by Johnson Matthey, United States. Similar to our above example, though the stampings were applied to reverse side of the bar which would have faced bottom of casting mould. Note smooth and square surface finish vs. poured example, above. We believe that the ‘JM’ and ‘0007’ serial number on the example below were fraudulently applied post production in order to inflate valuation. This resulted in considerable negative valuation and collectibility of this particular ‘JM 007′ example. | Serial Absent | <50 |
 | 10oz | [Diamond JM Logo with Crossed Hammers] [10 OZ.] [999+] | Cast Finish | 10oz example produced by Johnson Matthey, United States. Closer spacing on purity stamp than our example above. | Serial Absent | <2,000 |
 | 10oz | [Diamond JM Logo with Crossed Hammers] [10 OZ.] [999+] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 10oz example produced by Johnson Matthey, includes the JM LTD. ASSAY OFFICE stamp. | Serial Absent | <25 |
 | 10oz | [Diamond JM Logo with Crossed Hammers] [10 OZ.] | Cast Finish | 10oz example produced by Johnson Matthey, very rare example without purity or Assay Office stamp. | Serial Absent | <10 |
 | 10oz | [Diamond JM Logo with Crossed Hammers] [999+] | Cast Finish | 10oz example produced by Johnson Matthey, lacks weight class stamp. | Serial Absent | <5 |
 | 10oz | [Diamond JM Logo with Crossed Hammers] [10 OZ.] [999+] | Cast Finish | 10oz example produced by Johnson Matthey, United States. Similar to our above example but variation in weight stamp font. | Serial Absent | <25 |
 | 10oz | [Diamond JM Logo with Crossed Hammers] [10 OZ] [999+] | Cast Finish | 10oz example produced by Johnson Matthey, United States. Larger Diamond JM Logo with greater spacing between purity stamping. | Serial Absent | <2,000 |
 | 10oz | [Diamond JM Logo with Crossed Hammers] [10 OZ] [999+] | Cast Finish | 10oz example produced by Johnson Matthey, United States. Larger Diamond JM Logo with less spacing between purity stamping. | Serial Absent | <2,000 |
 | 10oz | [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [10 oz.] [999] | Cast Finish | 10oz example produced by Johnson Matthey & Mallory, Canada. Note the small font on ‘oz’ weight designation. | Serial Absent | <25 |
 | 10oz | [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [10 oz.] [999] | Cast Finish | 10oz example produced by Johnson Matthey & Mallory, Canada. Note the small font on ‘oz’ weight designation. Similar to our above example but demonstrates wider spacing of purity stamp. | Serial Absent | <50 |
 | 10oz | [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [10 OZ.] [999] | Cast Finish | 10oz example produced by Johnson Matthey & Mallory, Canada. | Serial Absent | <50 |
 | 10oz | [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [10 OZ.] [JM & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999] | Cast Finish | Very rare 10oz example produced by Johnson Matthey & Mallory, Canada. The example pictured sold via eBay auction on August 17, 2016 for $988.58. This particular example demonstrates a casting mould shape unique to other 10oz ingot varieties in that it is pudgier than the flat 10oz cast ingots and flatter than the pudgy 10oz cast ingots. | Serial Absent | <50 |
 | 10oz | [J M & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [10 OZ.] [999+] | Cast Finish | 10oz example produced by Johnson Matthey & Mallory, Canada. | Serial Absent | <25 |
 | 10oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [999+] [10 oz. TR] | Cast Finish | 10oz example produced by Johnson Matthey & Mallory, Canada. | Serial Absent | <50 |
 | 10oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [999+] [10 oz. TR] | Cast Finish | 10oz example produced by Johnson Matthey & Mallory, Canada. Similar to the example above but demonstrates purity and weight stamp placement variation. | Serial Absent | <25 |
 | 10oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [10 oz. TR] [999+] | Cast Finish | 10oz example produced by Johnson Matthey & Mallory, Canada. Similar to the example above but demonstrates purity and weight stamp placement variation. | Serial Absent | <25 |
 | 10oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval [10 OZ.] [999] | Cast Finish | 10oz example produced by Johnson Matthey & Mallory, Canada. This example demonstrates the larger 32.3mm x 21.95mm circular almost exclusively used on larger 20oz., kilo, 50oz. & 100 oz. class ingots. | Serial Absent | <5 |
 | 10oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval [10 oz. TR] [999+] [JM & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] | Cast Finish | 10oz example produced by Johnson Matthey & Mallory, Canada. This example demonstrates the 24.4mm x 14.3mm circular hallmark common to this 20oz weight class. | Serial Absent | <25 |
 | 10oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [JM & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] [10 oz. TR] | Cast Finish | 10oz example produced by Johnson Matthey & Mallory, Canada. Similar to our example above but includes varied placement of the smaller JM&M oval hallmark. | Serial Absent | <25 |
 | 10oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] [Maple Leaf Logo] [999+] [10 oz. TR] | Cast Finish | 10oz example produced by Johnson Matthey & Mallory, Canada. Similar to our example above but includes the Maple Leaf logo. | Serial Absent | <25 |
 | 10oz | [JOHNSON MATTHEY & MALLORY Oval Logo] [Maple Leaf Logo] [JM & M LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [999+] [10 oz. TR] | Cast Finish | 10oz example produced by Johnson Matthey & Mallory, Canada. Similar to our example above but includes the Maple Leaf and smaller JM&M oval logo. | Serial Absent | <10 |
 | 10oz | [BACHE Custom Hallmark] [10 OZ.] [9999] [JOHNSON MATTHEY & MALLORY Oval Logo] [CANADA Inner Oval] | [SAMPLE] | 10oz GOLD prototype example produced by Johnson Matthey & Mallory, Canada. While AE presents only silver examples on our Johnson Matthey Definitive Pages at this time, there have been so many inquiries regarding this gold prototype piece that we are presenting it nonetheless. This prototype ingot actually weighs 4.30oz and is produced out of base metal. The actual 10oz gold production examples are presented below, in two known variations, for comparison. | Serial Absent | <25 |
 | 10oz | [JMC Rectangular Logo] [999+] [10oz.TR] | Cast Finish | 10oz example produced by Johnson Matthey, Canada. | Serial Absent | <250 |
 | 10oz | [JMC Rectangular Logo] [JM LTD. ASSAY OFFICE Oval Logo] [CANADA Inner Oval] [Maple Leaf] [999+] [10oz.TR] | Cast Finish | 10oz example produced by Johnson Matthey, Canada. | Serial Absent | <10 |
  | 10oz | [JMC Rectangular Logo] [10 OZ] | Cast Finish | 10oz example produced by Johnson Matthey, Canada. This unique example includes only the JMC Rectangular Logo and weight class stampings. | Serial Absent | <5 |
 | 10oz | [JMC Rectangular Logo] [Maple Leaf Logo] [999+] [10 OZ] | Cast Finish | 10oz example produced by Johnson Matthey, Canada. A collector set of 3oz, 4oz, 5oz, 7oz and 10oz ingots was offered in 1965 by Guardian Trust Company of Montreal, Canada, for $57.03 not including postage – documented at this LINK. The collector set was available in two sizes, which may be found at this LINK. | Serial Absent | <250 |
 | 10oz | [JMC Rectangular Logo] [Maple Leaf Logo] [999+] [10 OZ] | Cast Finish | 10oz example produced by Johnson Matthey, Canada. Similar to our above example, but demonstrates a straight ‘|’ on the ’10oz’ weight class stamp, and a larger ‘OZ’ weight class stamp. This variety also demonstrates a less rounded obverse casting shape. | Serial Absent | <2,000 |
 | 10oz | [JMC Rectangular Logo] [Maple Leaf Logo] [999+] [10 OZ] | Cast Finish | 10oz example produced by Johnson Matthey, Canada. Considerably more rare variation of our example above. These ingots were also offered in a collector set which may be found at this LINK. | Serial Absent | <250 |
 | 19oz | [JMC Rectangular Logo] [Maple Leaf Logo] [INVERTED 999+] [10 OZ] | Cast Finish | 10oz example produced by Johnson Matthey, Canada. Similar to our above example, though demonstrates and inverted purity stamping. | Serial Absent | <5 |
 | 10oz | [JOHNSON MATTHEY LONDON Oval Logo] [REFINERS MELTERS Inner Oval] [999] [10 OZS] | Cast Finish | 10oz example produced by Johnson Matthey, London. | Serial Absent | <200 |
 | 10oz | [JOHNSON MATTHEY LONDON Oval Logo] [REFINERS MELTERS Inner Oval] [•9990] [10 OZS] [SILVER] | Cast Finish | 10oz example produced by Johnson Matthey, London. | Serial Absent | <50 |
 | 10oz | [JM Crossed Hammers Logo] [ASSAYERS & REFINERS] [FINE SILVER 999] [10 OUNCES TROY] [Serial Number] | Blank | 10oz example produced by Johnson Matthey, United States. | 007774 023437 038046 042125 077297 099498 | <50,000 |
 | 10oz | [JM Crossed Hammers Logo] [ASSAYERS & REFINERS] [FINE SILVER 999] [10 OUNCES TROY] [Serial Number] | [Unique Counterstamp] | 10oz example produced by Johnson Matthey, United States. This example demonstrates a unique hallmark on the reverse, pictured below, representing Dallas Gold & Silver Exchange, Inc. This hallmark has also been observed on 5oz California Crown Mint examples, to include ‘DGSE’ stampings. Our appreciation to Chris LoPriore for the information regarding DGSE! | 022160 | <100 |
 | 10oz | [JM Crossed Hammers Logo] [ASSAYERS & REFINERS] [FINE SILVER 999] [10 OUNCES TROY] [Serial Number] | [TD BANK Logo Repeated Six Full Times] | 10oz example produced by Johnson Matthey, United States, for TD Bank. | 000389 | <500 |
 | 10oz | [JM Crossed Hammers Logo] [JOHNSON MATTHEY] [ASSAYERS & REFINERS] [FINE SILVER 999] [10 OUNCES TROY] [Serial Number] | [TD BANK Logo Repeated Six Full Times] | 10oz example produced by Johnson Matthey, United States, for TD Bank. | 005680 | <250 |
 | 10oz | [JM Crossed Hammers Logo] [JOHNSON MATTHEY] [ASSAYERS & REFINERS] [FINE SILVER 999] [10 OUNCES TROY] [Serial Number] | [JM Crossed Hammers Logo Repeated Six Full Times] | 10oz example produced by Johnson Matthey, United States. | 090991 163408 210298 239841 297300 344351 399093 418915 500080 546599 571395 668016 996107 | <725,000 |
 | 10oz | [JM Crossed Hammers Logo] [JOHNSON MATTHEY] [ASSAYERS & REFINERS] [FINE SILVER 999] [10 OUNCES TROY] [Serial Number] | [JM Crossed Hammers Logo Repeated Six Full Times] | 10oz example produced by Johnson Matthey, United States. Similar to our above example, though demonstrates an ‘R’ serial prefix and slightly different ’10’ font on weight class assignment. Please note some examples have the ‘R’ within the serial number assignment, such as 7R2338. Our thanks to Szabi for assistance on this variety! | 7R2338 R5263 R15739 R22056 R23826 R26659 | <25,000 |
 | 10oz | [JM Crossed Hammers Logo] [JOHNSON MATTHEY] [ASSAYERS & REFINERS] [FINE SILVER 999] [10 OUNCES TROY] [Serial Number] | [JM Crossed Hammers Logo Repeated Three Full Times] | 10oz example produced by Johnson Matthey, United States. Similar to our above example, though demonstrates the JM Crossed Hammers Logo repeated only three full times instead of six full times. A keen eye will note that this reverse is typically seen on the 10oz JM platinum bars. | 185919 187651 199933 215128 273154 331924 345650 513090 850627 | <25,000 |
 | 10oz | [JM Crossed Hammers Logo] [JOHNSON MATTHEY] [ASSAYERS & REFINERS] [FINE SILVER 999] [10 OUNCES TROY] [Serial Number] | Blank | 10oz example produced by Johnson Matthey, United States. Smooth reverse finish variation of our example, above. | 115744 119937 145863 | <20,000 |
 | 10oz | [ROYAL BANK Custom Logo] [ROYAL BANK] [FINE SILVER 999] [10 OUNCES TROY] | [Serial Number] [ROYAL BANK Custom Logo Repeated Nine Times] [JM Crossed Hammers Logo] | 10oz example produced in 1989 by Johnson Matthey, United States, for Royal Bank. | 002237 002557 002641 | <250 |
 | 10oz | [JM Crossed Hammers Logo] [JOHNSON MATTHEY] [ASSAYERS & REFINERS] [FINE SILVER 999] [10 OUNCES TROY] [Serial Number] | [RANCHERS EXPLORATION Custom Logo] [ESCALANTE MINE] [1982] | 10oz example produced in 1982 by Johnson Matthey, United States, for RanchersExploration and Development Corporation of Albequerque, New Mexico. | 001470 002321 007522 | <1,000 |
 | 10oz | [JM Crossed Hammers Logo] [JOHNSON MATTHEY] [ASSAYERS & REFINERS] [FINE SILVER 999] [10 OUNCES TROY] [Serial Number] | [RANCHERS EXPLORATION Custom Logo] [ESCALANTE MINE] | 10oz example produced in 1990 by Johnson Matthey, United States, for Ranchers Exploration and Development Corporation of Albequerque, New Mexico. This example does not include the ‘1982’ date as our example above. | 005231 | <1,000 |
 | 10oz | [Scotiabank Company Logo] [Scotiabank] [FINE SILVER 999 in Rectangle] [10 OUNCES TROY] | [Serial Number] [JM Crossed Hammers Logo] | 10oz example produced by Johnson Matthey, United States, for Scotiabank. | 002913 004426 005729 011489 | <10,000 |
 | 10oz | [Circular Logo TEN OUNCES TROY FINE SILVER Circular Logo] [Republic National Bank of New York Inner Logo] [REPUBLIC NATIONAL BANK OF NEW YORK] | [Serial Number] [RNB Custom Logo Repeated Eight Full Times] [JM Crossed Hammers Logo] [ASSAYERS REFINERS] | 10oz example produced by Johnson Matthey, United States, for Republic National Bank of New York. | 008603 | <3,000 |
 | 10oz | [Statue of Liberty] [LIBERTY] | [MTB Oval Logo Repeated] [.999 FINE SILVER TEN TROY OUNCES] [SERIAL NUMBER] [UNITED STATES OF AMERICA] [JM Crossed Hammers Logo] | 1st series 10oz example produced by Johnson Matthey and Manfra, Tordella & Brookes, United States. Wide format bar as compared to the narrow format 2nd series variety, defined below. Lacks the “Copyright 1982″ designation (similar to the 1oz variety) and and serial numbers likely end at 7,500. It is important to note that the Metal Arts Company [MA] produced the first 10oz bars for MTB, serial range 1 to 5,000. Our appreciation to Barry H. for contributing his knowledge on these MTB bars. | 6741 6901 7108 7134 7484 | <1,000 |
 | 10oz | [Statue of Liberty] [LIBERTY] | [MTB Oval Logo Repeated] [.999 FINE SILVER TEN TROY OUNCES] [SERIAL NUMBER] [© 1982 MTB] [UNITED STATES OF AMERICA] [JM Crossed Hammers Logo] | 2nd series 10oz example produced by Johnson Matthey and Manfra, Tordella & Brookes, United States. Narrow format bar as compared to the wider format 1st series variety, defined above. Also includes the ‘Copyright 1982′ designation. Estimated serial assignment ranges from 7,400 to 16,200. While it may appear this Series 2 bar is taller than Series 1, both bars are the same height. Our appreciation to Barry H. for contributing his knowledge on these MTB bars. | 7462 7590 7703 8708 9430 10554 11836 12343 12820 13520 14083 16165 | <8,500 |
 | 10oz | [JM Crossed Hammers Logo] [JOHNSON MATTHEY] [ASSAYERS & REFINERS] [FINE SILVER 999] [10 OUNCES TROY] [Serial Number] | [JM Crossed Hammers Logo Repeated Six Full Times] | 10oz example first produced in 2012 by Johnson Matthey, United States. This is the most recent production 10oz bar and is currently in production. | A005193 | <5,000 |