It's a clashed cap strike, a type of brockage. A late-stage die cap collided directly with the reverse die when a planchet failed to be fed into the striking chamber. The working face of the die cap picked up a partial raised reverse design. It struck the next few planchets, one of them represented by this coin. The result is a strong ghost of Lincoln in association with a crisp, but incomplete brockage.
Error coin writer and researcher.