The Bausch & Lomb "Balvar" and "Balfor" were very popular in 50’s as well. These look like conventional internal adjustment scopes, however they use an external adjustment mount similar to the "Stith" that was popular in the 40’s. These scopes were very well made with excellent optics.
Steve
I have this 30-’06 from the time period you are looking at and what I think is a very early Weaver K4 with the exposed adjustments. It also has the range finding reticule. I think the glass is very good yet to my eyes. I do not know when the Weaver detachable top mounts came out. I have no idea if the set up is original to the gun or not. Very slight wear marks indicate it did have a standard rear sight on the barrel at one time. I wanted to have one scoped bolt gun to hunt with and this is the only bolt action and scoped rifle I have. Probably not serious collector material here. I am enjoying shooting the hell out of it however.
http://s1226.photobucket.com/user/hurint/media/1894%20sight%20reference/1abc_zps51656801.jpg.html[Image Can Not Be Found]
Brad

I kind of like this set up on one of my M70s, .300 Win Mag with The Bausch & Lomb Balvar
http://s517.photobucket.com/user/RoadKing1998/media/DSC05854.jpg.html
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