Check on the barrel for the model number, without it, you can't tell when it was made for sure. Most likely, it's one of these models, and if so, these are the manufacture dates: Model 1866 made "after" 1899, Model 1892 made in 1915, Model 1894 made in 1916, Model 65 made in 1915. Hope that helps.
With the serial number that you have provided,your Winchester model 88 lever action rifle was made in the year 1962.
with the serial number that you have provided,your Winchester model 1873 lever action rifle was made by Winchester in the year 1886.
Your Winchester model 1897 pump action shotgun cannot be dated without you providing the serial number to it.
With the serial number that you provided,your Winchester model 1897 pump action shotgun was made by Winchester in 1924.
With the serial number that you supplied,your Winchester model 1912,pump action shotgun was made in 1961.
With the serial number that you provided,your Winchester model 12 pump action shotgun was made in the year 1923.
With the serial number that you have provided,your Winchester model 70 bolt action rifle was made in the year 1982.
With the serial number that you provided.Your Winchester model 88 lever action rifle was made in 1960.
With the serial number that you have provided,your Winchester model 1897 pump action shotgun was made in the year 1899.
Impossible to answer without the serial number.
With the serial number that you provided,your Winchester model 1912 pump action shotgun was produced in the year 1949.
With the serial number that you provided,your winchester model 88 lever action rifle was made by winchester in the first year of production,which was 1955.