your Winchester model 12 shotgun was made in 1940.
1932
your Winchester model 12 shotgun was made by Winchester in 1959.
1946
your model 12 Winchester shotgun was made in late 1959.
Your winchester model 12 shotgun was made by winchester in 1953.
year 1946
1928 Fred
Go to Proofhouse.com and look at the Winchester sn data.
your model 12 Winchester shotgun was made in 1953.
your model 12 shotgun was made in 1961.
year 1954