The book only shows 12 and 20 gauge.
If you have the money....
The BSS
1972
1986
12 gauge BSS were first made in 1971 and 20 gauge in 1972.
The case is fitted for the BSS line of double barrel shotguns made by Browning. It will fit other double guns as well.
This is a Browning Side by Side shotgun (Double Barrel) for a 20 Gauge shotshell. The production of the BSS side-by-side shotgun began in 1978. The Sidelock model was introduced in 1983. Production ceased in 1987.
You must call Browning with the serial number to find out.
1976
1972-1987
Made before 1975
50-1000 usd