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<p>[QUOTE=&quot;Jimski, post: 2712150, member: 77373&quot;]Here is my SWAG (Scientific Wild Ass Guess). </p><p>Although the Bronze Age began approximately 3000 BC, it seems to me coiners did not begin using it until the mid 19th century.&nbsp; So I&#039;m going to rule out bronze and alloys of it.&nbsp; It was a counterfeit gold coin, so I&#039;ll consider silver and Cu are possibilities.&nbsp; </p><p><br /></p><p>You didn&#039;t give the regal diameter, it looks like it should be 36mm in Krause.&nbsp; Which would make your 39 mm coin much bigger in diameter ... and it&#039;s still light.&nbsp; I&#039;ll assume the thickness is the same.&nbsp; The ratio of the diameters (or radii) squared is 1.53.&nbsp; This should also be the ratio of the volumes if thickness is the same.</p><p><br /></p><p>The ratio of the specific gravities of silver/gold is 0.554.&nbsp; The ratio of the specific gravity of Cu/gold is 0.463. </p><p><br /></p><p>The ratio of weights for the counterfeit/regal is 0.851. </p><p><br /></p><p>I think if I multiply the ratio of the volumes to the ratio of the specific gravities, I should get the ratio of weights.&nbsp; Doing this ... I get for silver 0.834&nbsp; ... for Cu 0.710.&nbsp; 0.834 is close (to 0.851) and closer (than the Cu 0.710).&nbsp; So I&#039;m going with Silver.&nbsp; With a confidence level of 1/8=12.5%.[/QUOTE]</p><p><br /></p>

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