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<p>[QUOTE=&quot;davidh, post: 2719792, member: 15062&quot;]Unless i didn&#039;t read it correctly, <a href="http://www.coinnews.net/2013/10/04/how-the-philadelphia-mint-polishes-dies-to-make-proof-coins/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.coinnews.net/2013/10/04/how-the-philadelphia-mint-polishes-dies-to-make-proof-coins/" rel="nofollow">this article</a> shows that Philadelphia and San Francisco don&#039;t do it the same way.</p><p><br /></p><p>Philadelphia Sandblasts the entire die to frost it, then masks off the frosted parts and then polishes around the masked off portion.</p><p><br /></p><p>San Francisco, on the other hand, polishes the entire die and then uses a laser to frost the desired parts.</p><p><br /></p><p>Does this different processing method show up as detectable differences on the coins themselves?[/QUOTE]</p><p><br /></p>

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