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<p>[QUOTE=&quot;desertgem, post: 4601247, member: 15199&quot;]Before 1990 or so, the main mint produced all of the dies and the branch mints S, D inserted the mint mark, During the years one mint might not use all of its dies and the other needed them. No one thought at the time they might be valuable I guess, so punching a S over a D in San Francisco , or a D over a S in Denver was no big deal then. Later each would make their own mintmark and use&nbsp; Phila dies to mm it., Then later the mint made master dies for each with separate mintmarks already on them , so overmint marks&nbsp; (OMM) were gone. That&#039;s the main reason when an OMM or RPM on&nbsp; current generation dies are reported, we know the chances are zero or man-aided somehow.&nbsp;&nbsp; I am doing taxes so you will have to lookup dates. Jim[/QUOTE]</p><p><br /></p>

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