1851 Large Cent, Variety, Strike Through, or Damage ?

I have this large cent that has lines, running diagonally in relief, on the reverse of the coin. It isn't a clash, nor could I find a Newcomb variety that shows theses lines. Any ideas? There are 2 sets at slightly different angles.

 

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looks like an N-19 to me.

 

Thank you. I was using the images on pcgs and couldn't find match, but with your response, I was able to find it on ngccoin. Neither offer an explanation of what caused those marks.