1936-1942
They are not marked, you can tell by the serial no. (well an looks ;)
i have old 12 guage double barell shotgun name is wards triumph model 5052a
Around $1000. in good condition.
If it is in excellent condition it might bring $1200 - $1500
$ 300-$500 if it is Police model with 18" Barrel, in good shape...I got one...
You may have some success at the shotgun world website, (shotgunworld.com) there is a vast network of collectors and shotgun experts there that may be able to help
1951 Model 37
The patent for Newport Model CN double barrell shotgun is 1915, but Newport was a named given to guns made by J Stevens, Ivers Johnson, and Crescent Arms. So most likely it was made in the early to mid 1900's.
50-160 USD
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.
It is a single barrel, break-away 12 gauge shotgun.
100-300 USD