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<p>[QUOTE=&quot;kangayou, post: 925444, member: 23111&quot;]After reading the &quot;Proof Coins and Sets&quot; section of the 2010 RedBook , I am confused.</p><p><br /></p><p>If almost all proof sets were minted at Philadelphia prior to 1968 and they were distributed in flat packs just like the uncirculated P-D sets , how can you tell them apart.</p><p><br /></p><p>It seems that the proof sets minted at Philadelphia from 1936 to 1968 were supposed to be of the &quot;Brilliant ,Mirror Like surface&quot; and not Frosted ( not cameo ).</p><p><br /></p><p>If the original mint envelope and insert card is missing and all you have is the &quot;P&quot; set in its original cello package , how can you tell Proof from Mint specifically for the years 1955-P through 1963-P ?[/QUOTE]</p><p><br /></p>

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