Sears sold imported Zoli shotguns as well as private branded Winchester 101 shotguns. Would need to know the model number off of the barrel.
Yes
1955?
245
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
Most are valued between 700-950 dollars in the condition that you describe.
The barrel of this shotgun simply cannot be removed. It is screwed in and requires a barrel vice and the appropriate wrench. The trigger group can be removed by means of the pin at the back of the receiver, which would allow for easier access to the barrel, but this is a complicated process and is not recommended. Nothing can be removed from the J.C. Higgins Model 20 to help clean it, unfortunately.
Needs to be looked at by a gunsmith
I usually use 1/4 on the bottom barrel (fires first) and 1/2 on the top barrel. This is because when the bird is fleeing you, the first barrel fires a bigger swarm. If i miss, the top barrel fires a more compact swarm for longer range.
Yes, it's a good utility shotgun. Nothing fancy or expensive. It is a Stevens/Savage 311 with the Sears trade name.
Post WW2 through the 1970's.
1950's-1960's
Would need the specific model number.