The lines are die cracks. They're all over this coin, both sides. What I'm wondering about is the blemish running from the D over the tip of the wing to the rim... 1921
In my opinion from the pic it looks a bit like damage rather than a strike through error. Just my two cents -James
I am not sure but if it was damage to the coin the lettering and feathers would also show damage? I does look like it could be a strike through but once again wouldn't the feathers and lettering show some affected areas as well? If I had to guess I would say that the field area which is incused on the die was either polised wrong or damaged in that area. If this were the case there would be numerous examples of the error. In short, I have no idea what it would be classified as and I have a hard time agreeing with James's opinion.