Clearer pictures would be better but since both sides seem to be word down and no date is visible I am going with wear/tear.
I would have to agree wear-and-tear based on the pictures you provided I have several myself. JMO Dave
Could be struck through grease, but after being worn through circulation and shot through plastic, it's really hard to tell.
Thank you. In my opinion it's a dateless, well worn buffalo nickel worth about .50 cents. I see no signs of a grease filled die, just wear.
It looks like acid may have played a role in it's life at some point. Maybe someone was trying to get back a date from a date less nickel and was unsuccessful.