I've been searching for info on a rifle like this for a long time. I bought one back in the early 90's. Marked mostly the same way except my "Springfield Armory" stamp is below the British B proof instead of above as shown in the OP's pics. What I'd really like to know is where the B D F stamp is from. Probably a story without an answer, but at least now I know my rifle is not a one-off so I'll keep digging for info.