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<p>[QUOTE=&quot;Hobo, post: 1429816, member: 11521&quot;]Interesting. I&#039;m guessing a planchet problem rather than a die problem. Proof dies are usually given very special care and have a relatively short live (in the range of just a few thousand coins for modern Proof dies) so I think we can rule out a rusted die. (Anyway, the imperfections appear to be incused on the coin and a rusted die would produce raised splotches on the coin.) And if a die produced several coins with this same imperfection other examples would be known and would probably be listed in a variety book somewhere. </p><p><br /></p><p>Another reason I think it is a planchet problem rather than a die problem is that the problem would have probably been detected rather quickly if the die was producing multiple coins with the same imperfection and taken out of the die press and the affected Proof coins would likely have been found and destroyed. I think it would be more likely that one planchet with imperfections (e.g., a pitted surface) could slip past the QC controls, especially when the imperfections end up on the reverse of the coin after it was struck.[/QUOTE]</p><p><br /></p>

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