The obverse of the nickel has olive green discoloration across the whole coin. The reverse speaks for itself. I am very curious if this is from the mint, or from someone's garage. Please leave me some feedback if you have seen this before.
I'm afraid its just a damaged nickel. Appears to have been sanded on the reverse. A coin is made by the planchet (disk) being squeezed between two dies. Would it be possible for the obverse to be fully struck and the reverse not to be?
If you want to have the very basics needed for determining if something odd you find is a real error, then look up videos on the minting process. Also use the following concerning how dies are made:
For example, with your coin, after seeing how coins are made, then it should make sense nothing like what you are seeing n the REV could possibly have been made at the mint.
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