If it is side-by-side, probably Stevens.
What is the value of a 12 gauge double barrel shotgun made in 1970?
The Sears Ranger 105-20 16 gauge shotgun came out in the 1930s. The Sears Ranger shotgun has a 26-inch barrel.
Most likely Stevens they did make a model #5100
100-10000 USD depending on EXACTLY what you have and its condition.
Stevens made for Sears Roebuck
I have a 16 gauge double barrel for sale.
Not enough information