2007P Washington one dollar.

[pennycat]

Very interesting dot.

[diamond]

Looks like a circular die dent. I have no idea what caused it, but the recessed margins suggest that it was generated while the die was still soft (annealed). The gutter around the dot corresponds with a pressure ridge on the die.

[pennycat]

Thanks, Diamond. Can that be call variety or error?

Thanks again.

[diamond]

Some would call it a die variety, others would call it a "die error". The overarching category doesn't matter. It's still a die dent.