1931-S Wheat Penny

Here's some info that might help; https://goccf.com/t/45662
Also some info from a grading company;
Carbon Spot - A dark discoloration on the surface of a coin. It is possible that this discoloration is caused by a planchet imperfection prior to striking, or it may be caused by improper storage of the coin. Regardless of the cause, carbon spots are difficult, if not impossible, to remove without leaving pits in the coin's surface. If they are large enough, they can significantly lower the grade and value of a coin.

Spots hurt. I'm sad to tell you, but based on those pictures, those spots are copper formate and developed from an old cleaning IMO. Is that coin in a PCGS holder?

Looks to be about 63, the spots hold it back.