If you have the money....
12 gauge BSS were first made in 1971 and 20 gauge in 1972.
You must call Browning with the serial number to find out.
It was made in 1981.
You risk damaging the barrels if you do.
That is the number of a Japanese contract-made Browning BSS. Current online prices are in the $900-$1500 range in as new condition, less used. (May 2012)
Browning.com has a sn function under customer service.
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.
BSS was made from 1971-1987