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<p>[QUOTE=&quot;Jral1, post: 1796479, member: 32252&quot;]Back to PIDT, could the thermal effect of modern high speed coining machines cause this to happen . Would the heat buildup after a long run in a high speed coining machine cause the coin to get hot enough to shrink a bit when it cools causing the oval/cresent that you see in the field of some coins. Also sometimes mimicking the bust or feature of the opposite side of the coin when it cools causing indirect design transfer.As a second way this effect could happen. do they <strike>coin</strike> (COOL)the machines or do they just wait to see smoke. Or is heat not even a factor at all in the process![/QUOTE]</p><p><br /></p>

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