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ġ0oz example produced by Johnson Matthey & Mallory, Canada. Similar to our example above but includes varied placement of the smaller JM&M oval hallmark.

& 100 oz. class ingots.ġ0oz example produced by Johnson Matthey & Mallory, Canada. This example demonstrates t he 24.4mm x 14.3mm circular hallmark common to this 20oz weight class. This example demonstrates the larger 32.3mm x 21.95mm circular almost exclusively used on larger 20oz., kilo, 50oz. Similar to the example above but demonstrates purity and weight stamp placement variation.ġ0oz example produced by Johnson Matthey & Mallory, Canada.

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. The example pictured sold via eBay auction on Augfor $988.58. Very rare 10oz example produced by Johnson Matthey & Mallory, Canada. Similar to our above example but demonstrates wider spacing of purity stamp.ġ0oz example produced by Johnson Matthey & Mallory, Canada. Note the small font on ‘oz’ weight designation. Note the small font on ‘oz’ weight designation.ġ0oz example produced by Johnson Matthey & Mallory, Canada. Larger Diamond JM Logo with less spacing between purity stamping. Larger Diamond JM Logo with greater spacing between purity stamping.ġ0oz example produced by Johnson Matthey, United States. ġ0oz example produced by Johnson Matthey, very rare example without purity or Assay Office stamp.ġ0oz example produced by Johnson Matthey, United States. Similar to our above example but variation in weight stamp font.ġ0oz example produced by Johnson Matthey, United States. ġ0oz example produced by Johnson Matthey, includes the JM LTD. Closer spacing on purity stamp than our example above. This resulted in considerable negative valuation and collectibility of this particular ‘JM 007′ example.ġ0oz example produced by Johnson Matthey, United States. We believe that the ‘JM’ and ‘0007’ serial number on the example below were fraudulently applied post production in order to inflate valuation. Note smooth and square surface finish vs. 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 square finish.ġ0oz 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. Similar to our above example, though of a slightly larger surface area as seen in the comparison photo below.ġ0oz example produced by Johnson Matthey, United States. ġ0oz example produced by Johnson Matthey, United States.ġ0oz example produced by Johnson Matthey, United States. Also note that our Definitives reflect what we believe to be the earliest examples first, followed by more recent production examples. Our Definitives, below, are organized region of origin.

We hope you welcome this new addition, and we look forward to your thoughts and input! As such, we appreciate the opportunity to present important bullion information on the world’s second most collectible refiner, Johnson Matthey. While our focus is clearly Engelhard, we recognize that many Engelhard bullion collectors also collect Johnson Matthey bars and ingots. ALL ENGELHARD is pleased to welcome visitors to our Johnson Matthey 10oz Definitive Page.