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<p>[QUOTE=&quot;CoinMagic, post: 24660592, member: 148457&quot;]I&#039;ve been reading the Red Book and am now almost half-way through it.&nbsp;&nbsp; Now in the quarters section.&nbsp;&nbsp; There are some numbers that puzzled me and I tried to do some further research on this site for resources.&nbsp; The only one that I saw is this link: </p><p>Numismatic Acronyms (Cited from: <a href="https://www.cointalk.com/threads/numismatic-acronyms.1559/page-3" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/numismatic-acronyms.1559/page-3">https://www.cointalk.com/threads/numismatic-acronyms.1559/page-3</a>)</p><p><br /></p><p>There were several instances of numbers that are listed in the Red Book that were a bit puzzling to me:</p><p><br /></p><p>1871CC</p><p>18410</p><p>18600</p><p><br /></p><p>I know that letters S, P, D, and W signify the mint location.&nbsp; What does &quot;O&quot; stand for?&nbsp; What is &quot;CC&quot;?&nbsp; Are these letters shown somewhere on the planchet?&nbsp; I did not see any such examples from the photos in the book.</p><p><br /></p><p>Could someone please elaborate on these particular letters?&nbsp; Thanks![/QUOTE]</p><p><br /></p>

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