I don't know. I have one also, and I am searching right for now for info. Sears did not make any firearms, but retailed firearms made for them under private brand names. Most of the Ted Williams branded guns were actually made by Winchester. If you can provide a model number, which is marked on the gun, we can be more specific. www.countrygunsmith.net
The Sears and Roebuck Ted Williams shotgun retails for about 250 dollars in excellent condition. This gun can be purchased for less than 150 dollars in used condition.
Winchester
Marlin Model 59, 1959-1961
Sold by Sears Roebuck. Probably manufactured by Stevens.
I believe that your Sears shotgun is a Winchester model 37A shotgun that was made for Sears Roebuck And Co,.
The Ted Williams 200 shotgun was manufactured by Winchester and was the same gun as their Model 1200.
It is a Winchester 101, made in Japan. Depending on condition, $600-$800.
http://www.histandard.info/PDF/Sears%20Shotguns.pdf
You would have to list the model number of your shotgun,to identify the maker of your sears and roebuck shotgun,in order to get the correct buttstock.
The Sears Roebuck Model 20 12 gauge shotgun, serial number 5832006 is valued at $200 in very good condition. It good condition, it is valued at $125.
about $100
need a diagram of sears model 66m shotgun for takedown