Sorry. On the reverse, the upper left rim is worn significantly more than the rest of the rim. Is this normal? What could cause such a difference? I don't see the same on the obverse.
It's post mint damage. Could have been anything that caused that. Dryer, getting rubbed on something good hard like cement, or it could have been dropped and spent so.excited time on the ground getting stepped on. That's is not something that happens during the minting process as far as I know.