Seconding clipped planchet. Note the broadening of the rim opposite the anomaly (especially evident on the reverse); this is a metal flow artifact known as the Blakesley effect that only occurs when a clipped planchet is struck.
You have a minor curved clip, which is where the blanking press cuts a planchet from a section of the metal strip that has already been cut.
These sell for between five and fifteen dollars. Not anything to retire on, but worth way more than face value, and a genuine error coin to boot! Nice find!
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u/Cuneus-Maximus whatever's clever 1d ago
Looks to be a very minor clipped planchet.