I have a nickel that is way thinner than any other. I can not seem to find any information on this. See pics
Can we have a clear, close-up photo of both sides? Often these have been acid-treated and thereby reduced in size. Not saying this is what yours is, just what it might turn out to be. Steve
Definitely Acid dipped. I see mushiness to the lettering and it's the only way it could get that thin.
Since the acid attacks the coin from all three dimensions , including the details of the coin. The mushiness that Paddy mentions is due to small amounts of convection of the fluid around the letters and devices. IMO, Jim
There is a slight upset rim showing. My vote is also shrunken in acid. It might have even been ground before the soak.