Blue Book of Gun Values has sn data in it.
@ 1974-1980
Compare it against known examples with a good date of manufacture.
Go to this web site for serial numbers and dates for Winchester arms: http://armscollectors.com/sn/winlookup.php?file=winxx52.dat
According to "Winchester - Dates of Manufacture", by George Madis, the firearm was made in 1964.
according to the Winchester "Dates of Manufacture" your gun was made in 1960.
http://armscollectors.com/sn/windates.htm
You cannot tell what the date of manufacture is based on the serial number of the gun alone. You must also know the model of the gun. For dates of manufacture for Winchester guns, go to: http://armscollectors.com/sn/windates.htm
Unfortunately the serial number provided does not match the format used by Winchester to track the manufacture dates of their firearms. Due to privacy concerns and security reasons Winchester does not share any information about their firearms and their serial numbers which makes it impossible to determine the exact manufacture date of the Winchester Model 70 with the serial number G2239505.
You should be able to contact Winchester and see if you may find the year of production by serial number thru there archives.If not I do have the manufacture dates of the first 250,000 made.You will need to have your serial number available to research the date of manufacture.
http://armscollectors.com/sn/windates.htm You can find most Winchester manufacture dates on the Antique and Collectible Firearms and Militaria Headquarters website at the related link >>>>
36,195.Reference from Winchester Dates of Manufacture 1849-2000 by George Madis. Art and Reference House Brownsboro,Texas 75756
The gun was made in 1941 You can research dates of manufacture by going to: http://armscollectors.com/sn/winlookup.php