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<p>[QUOTE=&quot;dcarr, post: 2165227, member: 4781&quot;]When a coin is struck, the metal is stressed and stretched in a certain way. The result is a distinctive ring sound that the struck coin will have when balanced and tapped. 3-D printing can replicate the basic geometry of a coin, but it can NOT replicate the internal metal stresses (or surface luster) of a struck coin.[/QUOTE]</p><p><br /></p>

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