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<p>[QUOTE=&quot;raider34, post: 767584, member: 16402&quot;]I would say one of the main differences is the rpm is exclusive to the mint mark, and an rpm doesn&#039;t always mean doubling. For instance the S/S, or O/O in the Morgan series, where the original mint marks were polished away (but not fully) and then the mint mark was punched into the dies again.</p><p><br /></p><p>When trying to tell the difference; the mint mark (if there is one) shouldn&#039;t be affected by a doubled die, since the mint mark is added to the working dies, while a doubled die occurs during the transfer from the hub to the working dies. On a doubled die there will be doubling evident on the rest of the coin (Motto, date, and the devices), while there wont on an rpm.</p><p><br /></p><p>*Ziggy beat me to it.[/QUOTE]</p><p><br /></p>

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