I was just trying to describe how the NRA buttplate was made. Its basically a shotgun style plate while the military issue M1 and M2 have buttplates that resemble the 1903, but without the trapdoor. If it doesn't have grasping grooves then its likely the NRA issue stock or an aftermarket stock. Does it have a front barrel band? The clip on my M2 only sticks out far enough to get a hold on it. So the stock you are looking at may be an aftermarket item. The comb heights are relevant to the NRA and military issue stocks. Keep in mind that these rifles went into production around the same time Savage brought out the 1920, so the combs are cut for open or peep sights and not optics.
