Coolray. I'm confused. Winchester Mod. 70's have a 3 position safety, not a Buehler. In checcking out my two Winchester Model 70 Featherweights, one a Pre-64 and the othe a post 1980's model, It should say WINCHESTER on the left side of the reciever and Trade Mark in smaller letters underneath the Winchester name. The T and four digit serial number doesn't strike me as right either, although I am definitely not a Winchester expert. I know that the Model 670 had a different safety, but you say your barrel is marked Model 70. I would suggest you take that rifle to a good gunsmith and have him check out the action. I have the feeling that maybe somebody put a Winchester barrel on a Mauser action, or some other than Winchester action. Just a sneaking hunch on my part.
Paul B.