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<p>[QUOTE=&quot;Conder101, post: 1605245, member: 66&quot;]In the case of proof coins the dies would be polished before any coins were struck, but after a given number of strikes the die begins to wear and starts to develop the microscopic flow lines that cause cartwheel luster and not the mirror smooth fields of a proof.&nbsp; Back in the 50&#039;s and 60&#039;s they would repolish the dies to remove the flowlines and restore the mirrors (Today they just retire the dies).&nbsp; Normally the polishing would not get down into the devices but with the big open areas like bust of Franklin or the Liberty bell it was a possibility.[/QUOTE]</p><p><br /></p>

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