your sears shotgun was made by savage arms.There model number was savage model 96.
No sn provided and there is no sn data for Sears.
I believe at one time,. Winchester made a model for sears. I had a sears M200 20 gauge and it was made exactly like my Winchester Modell 1300 ranger,.. very, very similar.
Winchester
sears roebuck and company
Winchester, same as model 1400.
It is a Stevens Model 250A, made by them for Sears, using the Sears J.C. Higgins trade name.
Stevens
Your sears shotgun was made by H&R.It is the H&R model 120.
The Sears Ted Williams Model 300, semi-auto, shotguns were made by Winchester. The Sears 300 is the same as the Winchester Model 1400.
I believe that your Sears shotgun is a Winchester model 37A shotgun that was made for Sears Roebuck And Co,.
That is basically a Savage Model 94 as made for Sears. Stocks are widely available from internet sources.