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<p>[QUOTE=&quot;satootoko, post: 21387, member: 669&quot;]Welcome to the forum Tia.</p><p><br /></p><p>&quot;S&quot; refers to a San Francisco mint mark.</p><p><br /></p><p>According to the Red Book, most of the 1979 proof cents minted at San Francisco had a &quot;filled&quot; mintmark, which means that instead of a sharply delineated &quot;S&quot;, there is more of a blob.&nbsp; As a result those with a &quot;clear S&quot; are listed in my 2003 Edition at $50, while the more common ones are listed at $2.&nbsp; There were 3,667,175 proofs minted that year, but the Red Book does not give a breakdown of the types.&nbsp; (Denver issued over 4.1-billion cents that year, and Philadelphia produced more than 6-billion.)[/QUOTE]</p><p><br /></p>

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