The Sears model 200 is a Winchester Model 1200.
I have a sears Ted Williams twelve gauge semi-automatic shotgun and it came with a barrel to fire slugs.
Ted Williams was the store brand name used by Sears. Laurona made the shotgun for Sears and stamped it Ted Williams for the.
Winchester
It is the Winchester model 1400, made for Sears.
High Standard made the Model 75 for Sears. http://www.histandard.info/PDF/Sears%20Shotguns.pdf
The Sears Ted Williams Model 300, semi-auto, shotguns were made by Winchester. The Sears 300 is the same as the Winchester Model 1400.
Marlin High Standard made the Model 75 20 ga semi-auto shotgun for Sears http://www.histandard.info/PDF/Sears%20Shotguns.pdf
Made by Meriden for Sears. 50-100 USD
Winchester, same as model 1400.
Stevens made for Sears Roebuck
Ted Williams guns were sold by Sears. Most date from the 60s and 70s.
Proofhouse.com has a store brand chart.