The safe itself is your problem. Sentry safes are well known for having excessive moisture issues. Sentry even has a warning about it on their web...
Would it grade ? No, the coin is damaged.
What's it worth is the single most asked question there is.
When you say "in the area of the safe" what exactly do you mean ? If you mean you are keeping 1 pack outside the safe but near it, then that pack...
If you are asking if it eventually cover the coin or a large portion of the coin - no, it won't do that. But the toned area around the dark center...
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