To find the year that any Winchester gun was made, you just need to know which model it is and what the serial number is (the model number and serial number are stamped on the gun itself). . Then go to this website and it will tell you when it was made: http://oldguns.net/sn_php/winmods.htm
Your Winchester model 1912 pump action shotgun was made in 1917 with the serial number that you provided.
Your Winchester model 1912 pump action shotgun was made in 1916 with the serial number that you provided.
With the serial number that you supplied,your Winchester model 1912 pump action shotgun was made in the year 1914.
your model 1912 Winchester shotgun was made in 1918.
Your serial number indicates that your Winchester model 1912 shotgun was made in the year 1920.
Your Winchester model 1912 pump action shotgun was made by Winchester in 1917,with the serial number provided.
Your winchester model 12 shotgun was made by winchester in 1953.
With the serial number that you supplied,your Winchester model 1912 pump action shotgun was made in the year 1916.
With the serial number that you provided,your Winchester model 1912 pump action shotgun was produced in the year 1949.
1929
With the serial number that you have supplied,your Winchester model 1912 pump action shotgun was made in the year 1959.
With the serial number that you provided,your Winchester model 1912 pump action shotgun was produced in the year 1955.