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<p>[QUOTE=&quot;Vess1, post: 734577, member: 13650&quot;]I just got, &quot;The official Red Book: A Guide Book of Buffalo and Jefferson Nickels, which came out in 2006.&nbsp; &nbsp; The beginning is quite interesting and it discusses a bit about how these mintmark errors came to be.&nbsp;&nbsp; Some here may find this very interesting as I did.</p><p><br /></p><p>&nbsp;&nbsp; It says beginning with the buffalo nickel in 1913, they began incorporating the date into the hub, master die and working dies.&nbsp; In other words, the date was no longer manually punched into the dies.&nbsp; &nbsp; Nickels needed mint marks for the first time in 1912 with the last Liberty Head&#039;s produced.</p><p><br /></p><p>&nbsp; These mint marks were the last feature that, for a time, still needed to be manually punched into the dies.&nbsp; &nbsp; This practice went on until the 1990s.&nbsp; </p><p><br /></p><p>&nbsp;&nbsp; This was done by hand so a number of variations occurred by simple accidents while trying to get the stamp lined up properly.&nbsp; &nbsp; All dies were produced at the Philly mint and sent out.&nbsp; (Denver produces some today)</p><p><br /></p><p>&nbsp; The D/S represents a set of dies that were originally destined for San Francisco that ended up going to Denver.&nbsp;&nbsp; Where they were manually over-punched for use there.&nbsp; </p><p><br /></p><p>&nbsp; It said that today, P, D, and S mintmarks are all included in the master die, which is then used to make multiple working dies.&nbsp; &nbsp;&nbsp; As a result, doubled, tilted, and other position variation mintmarks no longer occur (after the late 1990s).[/QUOTE]</p><p><br /></p>

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