The Winchester Model 37 was produced from 1936 until 1963, with the "Steelbilt" designation introduced in the late 1940s. To determine the specific age of an individual Model 37, you would need to check its serial number, as that will indicate the year it was manufactured. If your shotgun is a Steelbilt model, it could be anywhere from about 70 to 80 years old, depending on the exact year of production.
1930's
Serial # C861323
1957
your Winchester model 12 pump shotgun was made in 1936.
My information suggests that you have a Winchester model 101 which was chambered in either 28 gauge or 410 gauge,which was made in August of 1970.
Your Winchester model 37a was a reintroduction of the model 37 which occured between 1973-1981.That is when your model 37a was made.
The model 37 was produced from 1936 until 1963. They were not serialized.
Was made 1936
Blue Book of Gun Values
Impossible to answer without the serial number.
The Winchester model 1400 MK-II was made from 1968-1972.
The Winchester model 120 ranger was a economy version of the Winchester model 1200 shotgun.the model 1200 was produced during 1964-1981,and the ranger was also produced during this time.