For what it's worth, to these rather naif eyes, it sure looks like an RPM. Seasons Greetings One & All, J.T.
Given the shift away from hand-punched mintmarks, I'm not seeing how this could be an RPM -- but it sure looks like one. Damage, or something that got into the die, or both? I'll hold out for the experts...
I would agree but....... repunched over what? A RPM you can usually make out enough traces of the under mm. What would they be punching over? Not a D, S, or a P as I can see.