No such weapon.
your Winchester model 12 shotgun was made in 1949.with that said your model 12 with no special options would be worth between 500-700 dollars based on condition of the shotgun.
This will not fit a model 12
Your winchester model 12 shotgun was made by winchester in 1950.
Your winchester model 12 shotgun was made by winchester in 1928.
Your winchester model 12 shotgun was made by winchester in 1956.
Your winchester model 12 shotgun was made by winchester in 1939.
Your model 12 Winchester shotgun was made by Winchester in 1926.
your Winchester model 12 was made in 1970.
Your winchester model 12 shotgun was made by winchester in 1937.
Your Winchester model 12 shotgun was produced by Winchester in 1936.
Your winchester model 12 shotgun was made by winchester in 1947.
your Winchester model 12 was made in 1913.