I know this has been covered probably, but I don't feel like searching for it, and even if I attempted a search, I can never find what I am searching for on here anyway, and when I type in another search, I have to wait 15 minutes. Anywho... What is the difference between the two? I mean, I know what each one is, I just have a problem telling which is which on a coin. stainless
An RPM or repunched mint mark will ONLY affect the mint mark where as a Doubled Die, except in very minor instances, will affect multiple areas of the face of the coin. Pre-1990 coins the doubled die will not affect the mintmark as it was applied to toe die seperately. Richard
I would say one of the main differences is the rpm is exclusive to the mint mark, and an rpm doesn'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. When trying to tell the difference; the mint mark (if there is one) shouldn'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. *Ziggy beat me to it.
I believe the term error is used pretty loosely, technically both doubled dies and rpms are varieties, and not errors.
Basic rule of thumb An error originates in the coin manufacturing process. A variety originates in the die manufacturing process.
Yes RPM's are die varieties. You can learn a lot about them here www.coppercoins.com Charles is pretty much the authority on RPM's Richard
The other point to make is that an RPM is the term used (repunched mint mark) when the mint mark is the same. We use OMM (over mint mark) when there are different mint marks involved. So a D over D is an RPM S over D is an OMM
Thanks for the info :thumb:, I hadn't heard the term OMM. I changed the original example of the O/CC.
Hey you guys! (anybody 'member the old "Electric Company" ?) anyway . . . So hey, didn't Wixler somewhat recently talk about how "OMM" has been "filtered out" of the jargon for these types of errors, these days? And so, I would label mine a "1979- filled S/D RPM" ? is that correct? The last letter signifying that it's the more prominent one? I do ThankYou kindly for any response w/helpful corrections, if need be, my Good Sir. Felina {bit of a newbie}
