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Is this an RPM?

sumduncesumdunce Posts: 1,247 ✭✭✭✭

I found this while looking at a 1961-D Lincoln cent:

Second angle with less light running across it:

The point of interest is the bottom rear of the mint mark.

I am thinking it is an RPM but it could be an old (degrading) mint mark punch.

Any help would be greatly appreciated.



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