I'm not seeing a RPM, I don't see anything that looks like a part of another mintmark.
You might be seeing Die Deterioration Doubling since it does appear to be a late die state coin.
I agree with luvmyCAM that a closer image of the mintmark may show what you're seeing better.
You might be seeing Die Deterioration Doubling since it does appear to be a late die state coin.
I agree with luvmyCAM that a closer image of the mintmark may show what you're seeing better.




























