AU details (ED). that does not appear to be toning, it looks like environmental damage from what may be improper storage. it may, however, clean up based on what it is using either acetone or verdicare
The coin looks AU but we'll have to wait for you to post better photos when it arrives. I don't think anything will remove those dark spots without changing the color and surface of the coin.
I've seen that pattern before on silver coins. In those cases, the best guess was dipping, followed by improper drying on a paper towel. I wonder if something like that happened here?
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