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<p>[QUOTE=&quot;Burton Strauss III, post: 4508316, member: 59677&quot;]No... the mint does not sinter - sintering is pressing a metal powder into a mold and then heating it to create a solid. Typically the solid is porous and that would make a poor process for creating a coin.</p><p><br /></p><p>It just looks like environmental damage it was exposed to something, maybe a spray.</p><p><br /></p><p><br /></p><p>Lastly, the coin term is planchet, not planchette.[/QUOTE]</p><p><br /></p>

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