No sn provided and there is no sn data for Sears.
your sears shotgun was made by savage arms.There model number was savage model 96.
Try e-gunparts/used to be called Numrich arms/It's on the web
I believe that your Sears shotgun is a Winchester model 37A shotgun that was made for Sears Roebuck And Co,.
The Sears 16 gauge model 101.40B shotgun was manufactured between 1955 and 1968. This model was produced by the Stevens division of the Savage Arms Company and was sold under the Sears brand. It is a bolt-action shotgun, which was popular during that time for small game hunting.
Winchester
It will be marked on the barrel, but that should be a 12 g shotgun.
50-200 usd
I bought a sears 684 shotgun (12 gauge) at sears around 1979 , for $ 99
Winchester, same as model 1400.
Marlin High Standard made the Model 75 20 ga semi-auto shotgun for Sears 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.
Stevens