Well the lines are called rolling lines. The machine that made the zinc material, had to roll out the zinc to make it flat. These lines are seen on the planchets before and after the strike:
With the light is set at a lower angle when you take images, it creates shadows that show up in the coins images. The lines are usually not seen on coins until the BU look goes away on the copper/silver/nickel coins.
Also see on clad coins as well. But the plating on the zinc makes them stand out even more. No premium for these as all of them have it. (No one else notices it, but us)