Serial numbers have been observed in the following ways on Johnson Matthey Bars and Assay Cards: (Includes: Gold, Silver, Platinum & Palladium) 1 Letter followed by 5 digits: serial number 1 Letter followed by 6 digits: serial number. Johnson Matthey is a global science and chemicals company, and a leader in sustainable technologies, that applies cutting-edge science and chemistry to create solutions.

I thought serial numbers were usually put on larger bars only. Usually 50oz bars have s/n.but some not. All 100oz and above have s/n.generally.

Anything below 50oz probably sometimes has s/n. For example.Kitco 10oz Silver has s/n. But its.9999 pure too.

If you must account for the bars.its important to have a way to do that.to identify the bars uniquely in paperwork and records.otherwise its generally 'pool' PM. You could always stencil in your own markings. Last edited by HardlyPeeved; at 04:08 AM. I just picked up a Johnson Matthey 20oz bar with 999+ and JMLTD.

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Canada Assay Office stamped on it, it looks and feel like silver but it has not serial number which is pretty odd for Johnson Matthe. Has anyone else seen any 20 ounce JM bars with no serial? Is it the bank putting the serials on these or is it JM putting the serials?You can check out for picture of 20oz JM bars with and without serial numbers. JM is inconsistent about serial numbers; even their 100oz bars often do not have them, whereas most of their 1oz bars do.

Engelhard has serial numbers on most (but not all) of their bars. For other mints/refiners, it varies quite a bit (there are lots of 100oz bars with no serial number, for example).