No answer can be provided,without a serial number for the shotgun in question.
shotgun
Your serial number indicates that your Winchester model 12 shotgun was made in the year 1951.
With the serial number that you provided,your Winchester model 70 featherweight was produced in the year 1990.
your Winchester model 70 pre-64 featherweight was produced in 1961.
Your winchester model 70 featherweight,pre-64 rifle was made in 1956.
Proofhouse.com has Winchester sn tables. Proofhouse.com has Winchester sn tables.
5/30/1911
Your winchester model 12 shotgun was produced by winchester in 1947.
Sometime in the late 80's
Your Winchester shotgun was manufactured in 1914.
Cannot be answered unless you include the model of WInchester shotgun in question,along with the serial number.