i would at least try warm water in a sink and see what happens. otherwise, worthless. its worth a try. I once had a 1927 Caramel card of Ty Cobb with a one cent stamp affixed to back, placed it in a sink of warm water, and the stamp floated to top. I sent card to PSA and got a 1 grade, but I feel that was the best thing to do. Good luck sir.
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