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<p>[QUOTE=&quot;Burton Strauss III, post: 2675915, member: 59677&quot;]It depends on the series and timeframe. Early proofs were (double) struck on the medal press while circulation coins were (single) struck on another set. So the rims are square for a proof, vs. not for a circulation strike.</p><p><br /></p><p>Dies may be reused for circulation strikes after the proof run - or not. Based on known proofs, the markers can be compared - and some of them survive a lot of wear.</p><p><br /></p><p>It differs for each series and coin and the experts really do know.</p><p><br /></p><p>All that said, an impaired proof is worth less than it&#039;s unimpared cousin (e.g. PF65 vs. PF50) <i>probably </i>has more of a discount than MS65 vs. AU50.</p><p><br /></p><p>And a damaged proof is anybodies guess.[/QUOTE]</p><p><br /></p>

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