The last model 70 in 1963 was #581471. 1964 started with #700000.
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.
Your serial number indicates that your Winchester model 12 shotgun was made in the year 1951.
No answer can be provided,without a serial number for the shotgun in question.
With the serial number that you have provided,your Winchester model 70 bolt action rifle was made in the year 1990.
The value of a Winchester model 12 Featherweight shotgun is dependent upon a number of factors. The most import being the condition of the shotgun.
Mid 80s or so
Proofhouse.com has sn information.
5/30/1911
Blue Book of Gun Values is one place.
The MSRP on a new one is $1009.00