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<p>[QUOTE=&quot;desertgem, post: 1464496, member: 15199&quot;]That would give you enough to estimate a good specific gravity value...If your coin had no reeding on the edge, and was flat on both sides ( no raised or lowered features , which eliminates most coins, rounds, bars, etc. Specific gravity is the only thing to tell you the total composition comparison of a coin or bar. Heat conductivity, acid reaction, x-ray spectrometry, or mass spectrometers can only test the surface. Mass spectrometers usually destroys he sample if penetration below the surface of a metal is tested. If you had a top&nbsp; mineralogy research lab, you could be very sure of yes or no. Find a trusted dealer or use the direct US treasury offering of AGE or such rather than buying indirect from a 3rd party on ebay or CL. IMO.[/QUOTE]</p><p><br /></p>

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