I think this may be a circulation hit that displaced the metal of the rim. As noted, most Cuds
show as a smooth raised area on one side with weakness on the opposite side, due to a loss of pressure, Here's a detail of a Cud
nickel showing both.
ID: 3203813 - CONECA ID: N-5637 Clean a coin that may be worth collecting? Please DON'T! When in doubt, leave it dirty!!