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<p>[QUOTE=&quot;messydesk, post: 2199705, member: 1765&quot;]I&#039;ll bet it used to be a silver dollar, then.&nbsp; The diameter of a new one is 38.1 mm.&nbsp; Assuming the wear is uniform, the loss of 0.43 mm in diameter also means a 0.43 mm loss in thickness.&nbsp; The thickness of a new silver dollar would be 2.49 mm.&nbsp; The volume of a new silver dollar is 2838 mm³, while the volume of yours is 2284 mm³.&nbsp; Since the surface of a new silver dollar isn&#039;t uniform like your is, however, the average thickness is a little less.&nbsp; The density of coin silver is 10.33 g/cm³ or 10.33 mg/mm³, so a new coin that&#039;s 38.1 mm in diameter and weighs 26.7 g would have a volume of 2585 mm³.</p><p>&nbsp;</p><p>I guess the bottom line is that the weight loss of 4 grams is more or less in line with what you have being a really slick silver dollar.&nbsp; The density of your coin would be just under 10 g/cm³, but my volume calculation assumes square rims, which is not going to be the case, so the actual volume will be slightly lower, making the density slightly higher.[/QUOTE]</p><p><br /></p>

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