I guess you are talking about the thing in front of his chin? Sometimes damage like this can be caused by heating with a little pinpoint torch.
Sorry, I just think that we are grabbing at straws here determining the nature of this obvious Post Mint Damage. Pictures are not up to par for the course so to speak.
Yes at the front of his chin and also on the back has the same Mark but not opposite of each other my camera's not great but I don't feel that this is something that was caused by circulation
Those latest photos show that a source of high heat caused the clad layers to separate and create a bubble. It’s damaged.