The ring looks awfully white... is the coin attracted to a magnet?
"Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer
Appears to be plain old environmental damage. This was caused by what ever this coin was exposed to. That could be almost anything, including just laying on the ground for a while.
It's very hard to know what the source of the damage is.
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