JJSR / J&J Smelting and Refining
J & J Smelting and Refining Corp. was a commercial assay laboratory located in California in the 1970’s. Hallmark typically is JJSR, often seen with a “S/C Circle” counterstamped.
- Company Location(s): California, West Coast Refiners
- Dates of Operation: 1970 -
- Known Bar Sizes: 1, 2, ~5, ~10, ~25, ~100
- Related Refiners:
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