Hello , Welcome new Member ! That's what they call here , "ZINC ROT". It's a bad situation man. Can't be stopped . Ok then, Peace !
I got better pics all add there’s extra letters an stuff to. Couple guys on another chat said plating blister
It could be blisters. The main thing with this gem is its damaged and has the start of zinc rot . There are no errors . NAV or No added value . Thanks for sharing .
Your coin is well advanced beyond simple plating blisters, which are usually caused by improper cleaning of the zinc blank before it receives its copper plating and as a result the copper doesn't adhere properly, and gas bubbles(blisters) form. Your coin has a bad case of Zinc rot and it would be best to spend it before you're left with nothing....