So I work at a gas station so I occasionally come across some cool coins. I've tried looking up similar ones via google and whatnot and have yet to find anything on possible value. I'm just curious.
It is adhesive. Try acetone. We are the specialist. We know how true mint errors are created and that is no mint error of any kind.
Just look at all the dings on the Eagles body. And the black remnants to the left and right of the Eagles head. It's been cleaned.