I think what you're seeing is a chip on the punch used to punch the mint mark. There is some serious glare on those photos, I'm assuming it's from the holder.
A damaged mint mark punch changes the appearance of the mint mark and can be confused with a re-punched mint mark. To help identify if a punch has been damaged or not, examine several dies from the same year. If they all have the same altered mint mark shape, they are most likely from a damaged mint mark punch. If it is a true RPM, only one die will be affected.
Looks like flat field doubling. You see this on proof coins as they are struck more than once. Another form of MD on proof coins, the flatten part of the previous strike. No premium for this though.
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