
with both of you as Dearborn says, can't really tell without better photos, but as Brandmeister says if it is RPM, it's most likely the D over horizontal D RPM, not the D over D, or D over S RPM.
For sure definitely need much clearer photos of the mint mark. If it's full of dark gunk, then a soak in acetone and some very light agitation using a Q-Tip on it may help loosen the gunk up enough to show it better. Since it's already a circulated and worn coin it won't hurt value unless you are too aggressive and make it appear cleaned.
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