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<p>[QUOTE=&quot;desertgem, post: 1770095, member: 15199&quot;]I also think it is circulation wear . The dies can not be perfectly vertical or it would be difficult to retract it after striking the surface, so some beveling has to be present, which will tend to make the devices &#039;thicker&#039; when worn, and also circulation can tend to press down the relatively soft copper&nbsp; alloy, and by flattening it somewhat make it appear thicker.[/QUOTE]</p><p><br /></p>

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