Just damage from an unknown source. See how the coin's rims are full and don't fade like a clipped coin rim should? They even look a little jagged from when the damage happened.
It's a damaged coin. Your coin also has Zinc rot setting in as well, from the Copper plating being pierced, exposing the Zinc core. It's Post Strike Damage (it happened after it left the U.S. Mint).
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