He's already told us about the markings in earlier posts. I would say it was sanded and refinished during a rebuild at one time or another. I have a six digit Inland (476K) that I believe has the original stock. The wood is a bit higher than the butt plate and yours seems about even with it. I tried to make a composite picture with your stock and mine. Didn't turn out real well, but you should be able to see what I'm talking about. - Bob