I posted about the possible existence of these a few days ago, and decided to check all the 1980-89-Ps on my most recent hunt. To my surprise, I found one that I think may actually be an RPM. I've examined it pretty carefully, and I believe the doubling is not caused by a contact mark or MD as there is a separation line and extra thickness. If I am correct, I believe it is a RPM with clockwise rotation after the initial punch.
Looks like a damaged line. Note when you view the whole mintmark. The normal shape is there, but the coin scratch altering the area you are looking at.
Unfortunately, its looking like a contact mark to me as well. If everything left of the line is a secondary mintmark punch, then the P would be slanted, italicized. Doesn't appear to have an increase in size especially in that last photo.
Thanks guys, appreciate the second set of eyes on this one. I'll definitely keep looking since I think it would be very cool to confirm the existence of an RPM on one of these 1980-89 P's
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