Cut lines horizontal and used a roll stamp to finish perhaps. But I think it was cut in both directions first and a roll stamp used to finish. The horizontal lines look deeper to me. Perhaps they guided the roll stamp. Do the edges look compressed like the 70's Remington pressed checkering? I think the lines were cut because they line up exactly in the vertical direction. If just roll applied the die would have to start exactly the same point in every line to keep them lined up like they were cut. It is a interesting and functional decoration of the butt stock.
