31pickemup
I certainly do not want to degrade your rifle.
There are others more expert than I on this subject but I shall venture some imfo based upon the pictures you have posted.
1. The barrel appears to be a shiny blue, not normal for a SA barrel of the era, so I suspect it has been refinished.
2. The receiver seems to be devoid of any finish. I believe that it should be a dark blue/black carbonia finish.
3. After examining the bolt picture, I believe that I see a "J5" stamped on the bottom of the safety lug. According to VI's Information, this would tend to put it in a small lot of DHT bolts that was made circa 1918 prior to the introduction of the curved bolt handle.
4. The windage knob appears to be of too early for a vintage for a 1939 rifle.
Given that it has a pre-war type C stock, I would guess that this is an assembled rifle by someone other than Springfield Armory.
My opinion for what it's worth. Looks like a nicer rifle. Only shooting will tell you the quality of the barrel. The above observations were made on the basis of your pictures. Close physical examination by an expert may tell a different story.