Around $1000. in good condition.
$ 300-$500 if it is Police model with 18" Barrel, in good shape...I got one...
1936-1942
They are not marked, you can tell by the serial no. (well an looks ;)
I can say that the Stevens model 311 side by side shotgun was discontinued in 1989.I would go to the Savage arms web site,they may be able to help you find out when the manufacture of your shotgun was started.
i have old 12 guage double barell shotgun name is wards triumph model 5052a
Your Western Field model SB-312 double barrel shotgun was made for Montgomery Wards(western field) by the savage arms company.The Savage model 540D shotgun is the same shotgun as yours.If you go to the savage web site they may have more info on this model?
If it is in excellent condition it might bring $1200 - $1500
I also have a Stevens 311A Double Barrell, doubled triggered 12 gauge shotgun made by Savage Arms in very good condition and do not know the age or the value. My gun has a ribbed barrel, but the stock is not walnut. JT 1/19/08
twist rate in model 110 fp with 24" barrell
1966 to 1988
The Savage model 312 is an over under shotgun that Savage imported from Italy from 1990 through 1993. The shotgun was manufactured in northern Italy in the Gardone region.
Try Numrich gun parts.com