That is damage on the rim.
As for the stuff all over the coin, it could well be lacquer as suggested. I would give the coin a soak in acetone and see if it removes that. It would at least improve its appearance without harming the coin.
And if it is lacquer, that would not damage or alter the coin. It is simply a coating that can be easily removed with nothing done to the coins surface. Once done, correctly, you would never be able to tell it had been lacquered.
Edited by smokeriderdon
09/13/2023 12:41 pm