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<p>[QUOTE=&quot;-jeffB, post: 2594558, member: 27832&quot;]A dollar FV of uncirculated clad coins (dimes/quarters/halves) is supposed to weigh 22.68 grams. A dollar FV of uncirculated silver dimes/quarters/halves is supposed to weigh 25.00 grams.</p><p><br /></p><p>But production isn&#039;t perfect, so these weights can vary, and I still haven&#039;t found an authoritative source stating official tolerances. (<a href="https://www.law.cornell.edu/uscode/text/31/5112" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.law.cornell.edu/uscode/text/31/5112" rel="nofollow">The relevant U.S. Code, 31.5112</a>, doesn&#039;t state them, although it does state some limits on alloy variance.)</p><p><br /></p><p>About.com says clad half-dollars can vary by +/- 0.454 g. That translates to a +/- 9g variance in the weight of a roll (although the odds against getting a roll with all coins at one extreme or the other are astronomical).</p><p><br /></p><p>More importantly, though, coins lose weight as they circulate, albeit slowly. A silver dime that&#039;s lost 10% of its weight to wear, bringing it down to the weight of a clad dime, would certainly be worn down to Fair or AG at best -- but I&#039;d still hate to miss it in a roll.</p><p><br /></p><p>Catching 40% halves by weight is even harder, because their weight is closer to that of a clad half (90%: 12.5g, 40%: 11.5g, clad: 11.34g). I doubt that you could reliably distinguish all-clad rolls from rolls containing 19 clad and 1 40% just by weight -- that .16-g difference would be swamped by normal variation in the rest of the coins.[/QUOTE]</p><p><br /></p>

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