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<p>[QUOTE=&quot;Insider, post: 2473177, member: 24314&quot;]I examine coins with a stereo microscope looking for microscopic diagnostics.&nbsp; I know one of the guys at NGC takes micrographs of each proof he sees.&nbsp; There was an entire thread about circulated proofs in another forum - NGC I think but may be Collectors Universe.&nbsp; Roger Burdett was posting in it.</p><p><br /></p><p>Note:&nbsp; I just looked on Coin Facts.&nbsp; There are several obvious diagnostics visible.&nbsp; On PR-35 on down they would probably be worn off.[/QUOTE]</p><p><br /></p>

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