Its an Auto-5 Standard, Manu'd between 1903-1940, but most likely 1923 or later. If it has the 2 9/16 chamber, that knocks the value down ab 25%.
Requires professional appraisal.
Your prefix of zero S indicates that your Browning sweet sixteen shotgun was made in the year 1960.
Browning.com has sn tables you can look at.
Your browning sweet sixteen was made by browning in 1953.
Your browning sixteen gauge shotgun was made by FN for browning in 1949.
Your browning sweet sixteen was made by FN of belguim for browning in 1924.
Your browning sweet sixteen shotgun was made by FN for browning in 1928.
Your Browning sweet sixteen was made in the year 1955 with the serial number that you have provided.
Your Browning sweet sixteen was made by FN of belguim for Browning in the year 1955 with the serial number that you provided.
Your browning sweet sixteen was made by FN for browning in 1951.
Your browning sweet sixteen was made by FN of belguim for browning in 1966.
your browning sweet-sixteen with the serial number you provided was made by browning in belgium by FN in 1956.