It will be stamped into the side of the receiver.
The Winchester model 270 was produced from 1963-1974.Winchester did not keep records of the production by year of these serial numbers.
On the barrel.
The best that I can do for you,is say that that the winchester model 270 was made by winchester between the years 1963-1974.Winchester did not keep yearly production figures on the model 270.It was grouped together as the model 200 series of rifles.
Post 1982
With the serial number that you have provided,your Winchester model 70 rifle was made in the year 1966.
The Winchester model 670,and 670 Magnum models were only made from 1967-1973.
Go to Proofhouse.com and look at the Winchester sn data.
your winchester model 270,22cal gun was produced by winchester between 1963-1971.They did not keep yearly serial number records,so that is the best that I can do,sorry.
Your serial number indicates that your Winchester model 70 bolt action rifle was made in the year 1956.
Remington never made the Model 4 in 270 Winchester.
The Winchester Model 270 slide action .22, also known as the Winchester Model 270, was produced from 1936 until 1963. To determine the exact manufacturer date for a specific serial number like 102109, you would need to consult a Winchester production records resource or a firearms expert, as the serial number can indicate the year of manufacture within that range.
Your Winchester model 670 economy version of the model 70 bolt action rifle was made between 1967-1973.