At first glance, I was thinking linear plating blisters but the direction of the lines (NW-SE) leads me to believe they are die scrapes from feeder finger damage. If I remember correctly these die scrapes only show up on the stationary (anvil) die, which isn't moving.
On wheat cents, these scrapes show up on the reverse in a north-south direction between EPU and ONE.
This is a really nice example and like lCutler said, much too large to be from die polishing.
(Kind of hard to tell but is this a zinc cent, mid "90's maybe?)