Looks like someone took a very sharp blade and passed it at an angle on the surface. To straight to be a Die Crack
I don't think so. I felt it with my nail and couldn't feel anything. I tried to rub it off, as if it were something left on the coin, but it wouldn't rub off.
Might it be some sort of problem with the planchet? An in perfection in/on the strip it was punched from perhaps. That type of "error" would not be raised.
The left end goes under the P/PLURIBUS. The middle and right end rides on top of the hair, cotton bolls and 2nd U/UNUM. So, it looks like a scratch or planchet flaw of some type. Somehow, the scratch failed to mar the P of PLURIBUS, OR, if a planchet flaw, the striking process did not lessen the flaw. Probably the scratch. Best theory I have…Spark