The link below has images of two pennies I believe to have re-punched mint marks. The images are clickable for more detail. As I've never had a confirmed re-punch and I'm curious to see if I'm right.
Nice images but both show the same thing. The striking breaks a small cut in the plating and air starts to work with the zinc. It usually raises for a while, then falls when enough space is dissolved and it only get worse after that. Just a pair of regular Cents with the same problem. Always a dead giveaway on these is the direction of the movement of the dies. The lower part of the mint mark is usually the area affected. Sorry, keep searching and posting as something will eventually appear.
Gotta question: from 1985 onward, weren't mm added to the master die, which would make cases of RPMs a bit more rare? Or am I opening a "can of worms"?
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