12 gauge BSS were first made in 1971 and 20 gauge in 1972.
1976
50-750 usd
1973
YEAR 1973
Depending on condition 200-800 USD.
You can start your search at browning themselves,if you have no luck you may want to go to numrich gun parts corp.
1980
50-1000 usd
300-600 usd
The (7) digit serial number of a Browning BSS breaks down like this: The first (4) digits represent the number of the gun in the production run. yours was the 7,327 gun made that year. The next Digit "A" represents 12 Gauge (B for 20 Gauge). The final (2) digits represent the year of manufacture. In your case 1972. Hope this helps.
try looking it up at the Browning date your gun link http://www.browning.com/customerservice/dategun/index.asp