Depends on model and condition. It was not made by Sears, but by another gunmaker FOR Sears.
Probably Harrington & Richardson
High Standard
The Sears Roebuck model 410 103.741 is a shotgun that was produced in the early 1960s. Specifically, it was manufactured around 1964. The model number indicates it was part of Sears' line of firearms, which were often made by other manufacturers and sold under the Sears brand.
The Sears 410 model 101.1120 was manufactured by the Montgomery Ward company. It is a part of the line of products sold under the Sears brand, particularly during the mid-20th century. This model is often associated with the sewing machine category, reflecting the era's focus on home appliances and crafting.
Your shotgun was made for Sears by Stevens, and is their model 311. It should take 2.5 inch and 3 inch .410 shells.
The Sears 410 Model 1011380 was manufactured in 1970. This model is part of the Sears line of shotguns produced during that time. It's important to check the specific details of the firearm for the exact year, as variations may occur.
You can find a store brand chart at e-guparts.com that might help.
The same, Its a Stevens model 95, a Savage 96 and a sears 101.100
About 100 US dollars
Depends on the model. We usually have parts.
www.e-gunparts.com