This is one type of PMD. What do you think happened?

Asphalt / concrete / granite bar top

 

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Jeweler
"improvement?"

 

"ping test" damage.

Seriously though probably something along those lines, or someone biting it more than a few times.

 

This is an example of a TERRIBLE attempt by a at hiding a damaged cheek. It is NOT what we usually refer to as tooling although a "tool" was used to dent the surface. A more sophisticated and deceptive repair is done with a very tiny rounded punch.

PS In the hands of a really good "artisan," this coin can be made much more "presentable."