Need detailed description of all markings.
1938 to 1965
Your winchester model 12 shotgun in 20ga was made in 1913.I should point out that the chamber of your 20ga shotgun is 2 1/2in.The winchester model 12 in 20ga was chambered in 2 1/2in until 1927.So caution is advised when shooting your shotgun!Do not attempt any modern day shotgun shells that have a length of 2 3/4in.
your savage model 311 double barrel is valued at between 130-275 dollars depending on condition.You can add 20% to those fiqures because it is a 20ga model.
Your serial number identifies your Winchester model 101 shotgun as being chambered in 20ga,and having been made in March of 1966.
Your browning 20ga model auto-5 shotgun was made by FN of belguim for browning in 1962,with the serial number provided.
I have a Winchester Model 240W Westernfield "12 ga." (not 20ga.) shotgun. It was a knockoff of the Winchester model 1400, made for Montgomery Wards. I've seen them sell anywhere between $200 and $250 depending on condition.
Bill Goforth has an excellent book on the H&R shotguns. You can do an internet search to find a copy.
The age of this gun, if it has no suffix on the model#,was probably made between 1942 and 1950. The value on this gun, in very good condition, is around $80.00 to $100.00. Savage made the 220 in 12-16-20-410.(not sure about 28). Barrel length varied from 26 to 32 inch.
Savage guns were manufactured in Chicopee Falls from 1946 to 1960. A 410 single shot could bring from $75 to $150.
The age of this gun, if it has no suffix on the model#,was probably made between 1942 and 1950. The value on this gun, in very good condition, is around $80.00 to $100.00. Savage made the 220 in 12-16-20-410.(not sure about 28). Barrel length varied from 26 to 32 inch.
Early 1960's. There will be a two upper case letter assembly date code on the barrel. http://www.histandard.info/PDF/Sears%20Shotguns.pdf
Need to know exactly how the gun is marked, including any punctuation in the model number. In any event, 20ga single barrel shotguns are going to sell for under $100. sales@countrygunsmith.net