Rock polisher perhaps? Something mechanical I would think, as it's so uniformly reduced at the edges. I'd keep this one in my 'WhatzThat' collection or drop it in my pocket so I could give it a quick rub every now and then... you know... for luck!

ANA ID: 3203813 - CONECA ID: N-5637 Clean a coin that may be worth collecting? Please DON'T! When in doubt, leave it dirty!!
