Hey Justin. Just scanning the old posts and ran across your inquiry. I know mine aren't in the '49-'50 range that you're looking for but I thought I'd throw in my data for whatever help it could be.
RM, are you still wanting pics of the receiver, etc. for the Russian Serial Data Board? Don't know if that's still ongoing, or not?
I have two '54 refurbs.
1.) '54 Tula NHM SAC, CA import. SN: HП 4662 Smooth black painted surface on the Receiver Cover, Bolt Carrier, etc. The bayonet is still "in the white", or however the original bayo finishes are described. The stock and handguard are of the hardwood (Birch?) type. The Rear Sight Leaf and RSL Spring have been replaced with "in the white" parts, as well. The Recoil Spring Assembly has the blued spring guide, with the recoil spring "in the white".
2.) '54 Tula CAI ST ALB, VT import. SN: ИП 3791 Smooth black painted surface on the Receiver Cover, Bolt Carrier, etc. The bayonet is still "in the white". The stock and handguard are of the laminate style. The Rear Sight Leaf and RSL Spring are "in the white". The Recoil Spring Assembly has the blued spring guide, with the recoil spring "in the white".
firstchoice