when i first saw it thought it was a pen mark,but wouldnt wash off Looks like a crack but doesnt feel like one, also will fade if in bright light...it was hard to get a pic.
Gonna need non-grainy pictures to determine. But from what I can tell, looks like a permanent marker or sharpie, which usually don't come off with water or washing. Please don't rub, wash or clean your coins, at least don't before determining if the coin has any value or not.
