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This is a privately issued piece and is called a 'silver round', usually a one Troy ounce (31.1 grams) of silver. It should have .999 and the weight somewhere on the piece.

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12y ago
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Q: What is a silver trade unit 1981 fomely stored at san fransico with a mint mark of two c's overlapped and words usassay office one side trade unit on the other dated 1981 Carson City mabe?
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