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<p>[QUOTE=&quot;halfcent1793, post: 3358275, member: 86853&quot;]I can speak to some of the issues raised, particularly by GDJMSP, from the perspective of corroded early coppers. I&#039;ve done a number of tests on early copper cents that were corroded and from which the corrosion had been removed. Basically, even the removal of heavy corrosion has very little effect on the mass of the coin. This was quite surprising to me, but It was consistent. </p><p><br /></p><p>It&#039;s intuitive to think that much of the mass of the coin should be gone when it reaches Good, but when you think about the fact that the great majority of the mass of the coin is in the non-raised parts of the coin, the fact that very little metal wears away during circulation should not be surprising.[/QUOTE]</p><p><br /></p>

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