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<p>[QUOTE=&quot;DCH, post: 1316036, member: 8072&quot;]I wasn&#039;t referring to normal toning.</p><p>This coin is not silver as the term us usually used in numismatics...It&#039;s Billon.</p><p>In this case 60% of the coin is copper,&nbsp; so it takes very few silver atoms oxidizing before the visible color shifts.</p><p>Some billon coins were actually treated with acid to remove the surface layer of copper, giving the coin the appearance of good silver until the surface layer is worn off.</p><p><br /></p><p>But...if the weight is really 1.2g the whole billon thing doesn&#039;t matter.</p><p>Typically to lose 20% of its weight a coin would worn smooth.</p><p><br /></p><p>Assuming it has the same physical dimensions as a coin of 1.667g, then I calculate the specific gravity at 6.8(I&#039;m heavily medicated with the Flu so my math may be way off)...basically pure zinc.&nbsp; Depending on how much material has worn off it could stretch into the range of bronze, or some high antimony/copper alloy.</p><p><br /></p><p>What does your silver coin weigh?&nbsp; I wonder just how tight the mint standards were that year.....[/QUOTE]</p><p><br /></p>

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