It is part of the collection I inherited. As far as I know my father in law never removed it, he rarely bought loose coins only proofs, uncirculated etc and already Encased Coins
You see stuff like that from old push-in coin albums.
Definitely soak it in acetone as others have suggested. No rubbing but maybe a little bit of nudging with a Q-Tip during the soak to help move things along.
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