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<p>[QUOTE=&quot;Conder101, post: 1817686, member: 66&quot;]The valuable coins are pieces struck in proof at the San Francisco mint using a die that in error did not have the Mintmark punched into it.&nbsp; There were 3.2 million proofs struck in San Francisco WITH the S mintmark.&nbsp; There were also 377 million dimes struck in Denver with D mintmarks and 162 million dimes struck WITH NO MINTMARKS at the Philadelphia mint that year.&nbsp; The Denver and Philadelphia coins were business strikes and not proof coins.&nbsp; Proof coins are special coins struck at much higher pressure using polished dies on polished blanks resulting in coins with mirror finished fields.&nbsp; Your coin is almost certainly one of the 162 million Philadelphia coins and not one of the 20 or so San Francisco proofs without a mintmark.&nbsp; (Unless you personally removed it from an unopened 1971 proof set.)[/QUOTE]</p><p><br /></p>

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