From what I can see it looks like a strike through. The photos are the best and get blurry when I blow them up but I don’t see any signs of displaced metal. What for others to answer as they might see something I don’t. Welcome to CT.
Damage from being being struck by another object. Unlikely it happened during the minting process, which leaves PMD (Post [it happened after it left] Mint Damage), not an error.