What to do about this coin.

In this case, I would cook it. Take 2 tablespoons of Baking soda and 1 tablespoon salt in 2 cups water. Pour it into an aluminum or foil lined pan. Heat until it simmers. Stir with a wooden spoon; Watch the solution until it becomes clear. This will clean copper and deoxidize silver. Then you should be able to see what it is at least.

 

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