1920.
Your serial number indicates that your Winchester model 1912 shotgun was made in the year 1920.
Your Winchester model 1894 was produced by Winchester in 1912.
1912 is the date of manufacture
1912. DC
1916 year of manufacture is 1916.
Go to Proofhouse.com
your Winchester model 12 shotgun was produced in 1915.
With the serial number that you provided,your Winchester model 1912 pump action shotgun was made in the year 1941.
date of manufacture is 1915
According to OldGuns.net, the year of manufacture for Winchester Model 1912 serial number 466271 is 1927. Not sure if this is your gun, or what the value is.
1917.
With the serial number that you supplied,your Winchester model 1912 pump action shotgun was made in the year 1916.