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<p>[QUOTE=&quot;expat, post: 24865693, member: 111067&quot;]It looks like the S took a hit at that point. It is not possible for a mintmark of 1971 to be classifies as a DD. The MM was hand punched until 1990. Sometimes they needed more than one strike to get a good impression. If the punch was not positioned correctly the result was known as a re-punched mintmark (RPM). NOT what your coin has by the way.</p><p>Knowledge of the minting process and how dies were made would be an advantage to you. Also realising that there are thousands of ways for a coin to be damaged after it has left the mint as opposed to genuine varieties and errors.[/QUOTE]</p><p><br /></p>

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