Nick Stroebel's books lists the various years
that the scopes were manufactured. If you want
a scope that was made the same year as your rifle.
The Unertl Falcon 2.75x and Hawk 4x were made from 1950-1980
The Leupold M-8 4x didn't come out until 1965. But there
were earlier models like the Mountainer 4x from 1953 to 1960.
I like the Bushnell early Scopechief's which were made
from 1953 to 1965. I totally agree with Joe about the
Redfield bases and rings. The Stith, Kollmorgan, Redfield
line were marked Stith from 1950 to 1956, Kollmorgan from 1956 to 1959 and Redfield afterwards. The Lyman Challenger 4x was made from 1949 to 1957 and the All-American line from 1954-1961, the
Lyman All-Americans with the Perma-Center markings were made from
1962 to 1980. Lyman Alaskan's are nice but, it is hard to get one for less than 200, and then the rings aren't cheap either.