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<p>[QUOTE=&quot;Michael K, post: 3373515, member: 78298&quot;]A planchet is the blank metal disc the coin is created upon after minting.</p><p>If it is the wrong planchet, then it is not a half dollar planchet. Foreign coins are different sizes so they are not substituted for (usually) more valuable US coins.</p><p>Since the rims are full and complete, it is on a half dollar US planchet.</p><p>There is a possibility that it could have been a thinly rolled planchet.</p><p>There is a weight tolerance +/- on all coins. These coins weigh 11.34 g. with a tolerance of ± 0.454 g. So the range is&nbsp; 10.886-11.794.</p><p>At 10.4 yes it is slightly under tolerance, but prob. not enough to carry much of a premium, especially if it was caused by environmental damage.</p><p>If it is a slightly thinly rolled planchet, then it is an error with a small premium.[/QUOTE]</p><p><br /></p>

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