I sold such a gun about a year ago ( 6/05 ) for six hundred and fifty dollars. It was a "red letter" in about eighty percent condition of original finish with a repaired stock. The person who bought it back bored it for "turkey shooting". Go figure!!
"Your" Winchester Model 21 Double Barrel Shotgun was manufactured in 1933, giving it an age of 77 years, as of 2010.
The model will be stamped on the barrel right after the Winchester name.
10-500 usd
It was made in 1937.
Look on bottom of receiver and barrel
The Winchester 140 12 gauge has a choke barrel at 28". This is the same choke size as the 20 gauge model.
The Winchester Ranger Model 120 typically uses a 12-gauge shotgun barrel. To find a compatible rifled slug barrel, look for a barrel specifically designed for the Winchester 120 series, such as the Winchester 1200 or 1300. Ensure that the barrel is compatible with your shotgun's action and gauge. It's advisable to check with a firearms dealer or the manufacturer for the most accurate options available.
A Winchester 12 gauge model 1200 pump shotgun holds 2 in the tube and 1 in the barrel. So it holds 2+1 which makes 3 total.
Depending on condition 300-1000 USD.
Impossible to answer.
Your winchester model 12 shotgun was made by winchester in 1937.
Your winchester model 24 shotgun was made by winchester in 1947.