I think that's an example of what you might call AT -- Artificial Tenderizing. Someone pounded on it with something. Dents in the front, bulges in the back.
No error. That coin went several times around the block before the Vandals and the Huns got a hold of it.
I would be, too, after that kind of a beating. What is it that you think you're seeing? Do you think something was odd about this quarter before it was mangled? If so, how can you tell?