The winchester model 670,and magnum models were made from 1967-1973.
your winchester model 70 was made by winchester in 1972.
Go to Proofhouse.com and look at the Winchester sn data.
I can say that the Winchester model 670 and 670 magnum version,which you have was made by Winchester from 1967-1973.I am afraid thats all the info that I can find.
Proofhouse.com has sn tables.
Very little... Winchester did not introduce the 264 Winchester magnum cartridge until the year 1958. If your Model 70 is actually a 1955 vintage rifle, it is not factory original.
A Winchester model 70 XTR which was made in 1979 will bring between 350-500 dollars depending on overall condition,and that the bore is not eroded.this happens in a rifle with a serious overbore cartridge such as a 264 Win mag.
apporx. value
Sounds like you have a Remington Model 700 chambered in 264 Winchester Magnum. The 700 was made in 264 Win Mag from 1962 - 1977 and again for the 1986 Classic. Go here for a little history - http://www.chuckhawks.com/264mag.htm http://en.wikipedia.org/wiki/.264_Winchester_Magnum
I will start my answer with a question?Are you sure that your winchester model 70 was made by winchester in 1948?I ask this because the 300 win.magnum was not a chambering that was available until the late 1950,s.The cartridge was based on a 458 winchester magnum case that was necked down.The 458 winchester came into being in 1956-1958.It also spawned the 264 win.mag caliber,and the .338 win mag caliber.I would expect that your winchester model 70 rifle was rechambered at some point in time if it is indeed a winchester model 70 made in 1948.This can also be said if we are talking about the .300 weatherby mag chambering.
Your rifle is worth alot it is pre 1964 a 1948 model to be exact I would get a professional involved.The 264 was an awsome cal. It was known to be a little hard on barrels.Good luck!!
In order to answer your question,I will need more info.First is the firearm in question a bolt action rifle or a semi-auto.Second the caliber is 264 Win mag.not the model number,Is there a model number on your firearm?Third is there any reference to Browning on your firearm.The reason I ask is that the L prefix may be a indication you have a Browning safari bolt action rifle?If you can answer these for me they will help me identify your rifle and then we can establish a reasonable date of manufacture.