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<p>[QUOTE=&quot;-jeffB, post: 3058583, member: 27832&quot;]That&#039;s a difference in the wrong direction. 1964 90% coins weigh 12.5g (+/- 0.259g), 40% coins weigh 11.5g (+/- 0.4g), and clad coins weigh 11.34g (+/- 0.454g).</p><p><br /></p><p>So <i>in general</i> 40% silver coins weigh more than clad coins, but there&#039;s a good bit of overlap in their weight ranges. Each of the weights you mention is within tolerance for a clad coin. The heavier ones are within tolerance for both clad and 40%, but the lighter one is barely within tolerance for 40%.</p><p><br /></p><p>The 80% copper/20% silver alloy in the center of 40% coins is still a different color from pure copper; it&#039;s lighter and more orangeish.</p><p><br /></p><p>Specific gravity can be useful sometimes, but it&#039;s <i>really, really hard</i> to get useful measurements from something the size of a coin with home equipment. The measurement errors swamp the differences you&#039;re trying to measure.[/QUOTE]</p><p><br /></p>

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