Its hard to explain something you don't know, but it appears to be extra material along the rim? Took a q-tip to see if it falls off, but doesn't. any clue? thanks in advanced!
It is called either a die dent or a rim burr, can't be sure from pix straight-on closeup of area. Going to say a die crack with retained piece. Not yet a full rim Cud, altho that is the correct term.
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