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<p>[QUOTE=&quot;desertgem, post: 1454887, member: 15199&quot;]I agree with Zimmy. Acid treated PMD. In an acid solution , all 3 measurements are affected, diameter, thickness, and weight, and usually inthe same proportions. The details stay because this coin has a homogeneous composition rather than a clad, so the higher areas AND the lower areas are reduced somewhat equally. Not entirely equal, because striking pressure does change the resistancy to areas to the acid.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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