Mike diamond got what I was going to suggest, it's a struck through split planchet, but this was the split planchet. A split plamchet and a regular planchet were both in the coining chamber at the same time and this was the split planchet piece. The other part would be a uniface cent witha very sharply struck obv and the reverse would show the texture of the split planchet but be normal weight. (It may also show some very light traces of the reverse.) That sound right Mike?