Any BSS is rare as only about 1,200 or so were made. Made from 71-87. Gold triggers started in 1978
If you have the money....
1972
With the exception of 10-25, all BSS had a single trigger
1986
12 gauge BSS were first made in 1971 and 20 gauge in 1972.
You must call Browning with the serial number to find out.
1976
1972-1987
The BSS
1972
50-1000 usd
Made before 1975