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<p>[QUOTE=&quot;Hommer, post: 2618325, member: 73266&quot;]I should make that clearer. In 1968, the proof coinage operation at the Philadelphia mint was moved to the San Francisco mint that had been closed for 13 years. My guess is one or two of the die makers from Philadelphia got transferred too, and when they started, they forgot to put a mintmark on one of the dies. Easy mistake if you had been making dies at Philadelphia for years without a mintmark. So the famous &quot;1968 No Mint Dime&quot; is a proof coin without a mint mark. Yes they were only sent out in proof sets, but that was in 1968, almost 50 years ago. So you might get lucky and find one other than in a set, but if you do, it will be a proof. There was also a 1975 no s proof, but how it came about is a guess too.[/QUOTE]</p><p><br /></p>

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