It was made in 1937.
"Your" Winchester Model 21 Double Barrel Shotgun was manufactured in 1933, giving it an age of 77 years, as of 2010.
Winchester. sales@countrygunsmith.net
From what I could find your gun is made by Winchester. It should say it on your gun somewhere though.
Your shotgun was manufactured in 1947.
1956 This shotgun WA manufactured in 1956
The Winchester 140 12 gauge has a choke barrel at 28". This is the same choke size as the 20 gauge model.
Look on bottom of receiver and barrel
10-500 usd
Is this shotgun manufactured with a twist steel barrel
Your Winchester Model 12 Slide Action Shotgun in 12 gauge with serial number 1747610, was manufactured in 1959.
Model 1912 Manufactured 1926.
The model will be stamped on the barrel right after the Winchester name.