Hallmarks: CTO 1/10 10K - CTO is the maker's mark for O.C. Tanner Company of Salt Lake City, Utah, makers of fine jewelry since 1927.
Metal (s): 10K Gold filled
Gemstone (s): n/a
Date of Manufacture: 1940's
Weight: 9 grams
Comments: JSP testing solution is used to verify precious metals.
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