Nickel error?

Hi, first post here... I inherited a collection of coins awhile back and am sorting through them now. Came across this nickel. I searched the internet for error coins and didn't see anything else like this. Any comments would be appreciated. Thank you.

 

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Post mint damage. Could be acid, road rash, or environmental damage.

 

Probably acid. I have pennies that look like that.

 

Ok, so pretty much worthless if that's the case. Thanks.

 

Classic acid damage, worth 5 cents.