It doesn't look like an RPM to me, but then again, it could be. Because the image of the 2nd D is in the same direction as the first, I would guess Die Deterioration or maybe MDD. A closer image of the mint mark could help.
have a look at this site http://www.coppercoins.com/advsearch.php and see if it matches up to any know varieties there. It is a excellent site, very informative. Be sure to bookmark it for further research on the Lincoln Cent.
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