This is a great thread! I'm wondering if one of the experts might chime in here for me about barrel markings.
20 years ago I bought a Model 70 from a very old collector in Montana...he had a bunch of them! The one I bought is a Prewar Supergrade in 300 H&H Magnum (correctly marked "300 Magnum" on the barrel). The serial number is 48581, which dates it to 1942. It appears to have all the correct parts...bolt etched with the receiver serial number, SG marked magazine floor plate, standard SG stock with ebony tip, deluxe sling swivels, hard rubber Winchester marked grip cap, checkered steel buttplate, cloverleaf tang on the receiver, no screw holes on the top rear of the receiver, 26" barrel (measures 25.25 from the front of the receiver ring, and 26 from the gas port hole), integral front sight ramp, front sight hood, standard rear sight in front of the front receiver ring, etc.
I wanted to put a modern scope on it, but didn't want to ruin it by drilling holes in the rear of the receiver, so I had my father (a solid machinist) make a custom rear sight base that attaches to the two screw holes on the side of the receiver...it wraps around the receiver, and accepts a normal Burris ring. It looks great, and there is zero contact with the top of the receiver, but you have to look close to tell.
It's been 20 years since I had the action out of the stock, and I can't remember if I ever checked the markings on the bottom of it for date of manufacture, etc. I think maybe I looked years ago, and it was marked "41" but that could actually be some date research I did on a different gun.
In doing some research, I've seen people say that the barrel should be marked "Supergrade" in some fashion near the proof mark and date stamp, but I can't verify that. Assuming the rifle is all original, what should those markings be (realizing the year can be slightly off from the receiver date)?
I'm somewhat considering selling it, so if anybody wants to venture a guess on what it's worth, I'd be interested in hearing your thoughts. I never shoot it, and I don't hunt any more, so it's just sitting in the safe. I will say that it proved remarkably accurate with Federal Supreme 180gr Nosler Partition ammo...3/4" 3-shot groups at 100yds. The fact that it shoots so well, and that I have a thing for old Winchesters makes me want to keep it...it has a 52C and 97 as brothers.
These aren't great pictures (just took them a few minutes ago), but I know we all love pictures!