mint damage/error or post-mint damage?

If i recall correctly, this one was taken from a Vatican Mint set. If that is correct, then i would assume that the damage was caused by the mint since it hadn't seen circulation and shows very few marks anywhere else. But if this wasn't taken from a mint set, does this appear to be post-mint damage of some sort?
the area i'm referring to at at the top of the coin (reverse), in the first picture; the horizontal mark that goes through the letter 'M'.
Just curious, as i hadn't noticed this before. thanks for any input!


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Nice purchase and one I wouldn't mind having regardless. If it is indeed a mint error I for one would not pay a premium for it and in that rare case of an error I may actually subtract a little something from my purchasing price from a true "mint" coin...
Rick
1836 Capped Liberty
dime. My oldest US
detecting find so far.
I dig almost every
signal I get for the most
part. Go figure...