This is not a Sweet 16. Sweet 16's are the lightweight version of the Standard 16 guage. You have a Standard 16 that was made in 1930. Value is too difficult to be accurate without seeing the gun. Condition which includes the amount of original finish and original configuration will determine value. Auto 5's with poly-chokes, compensators and recoil pads (other than Mag 12's) will reduce value. Near mint guns and original box will command an extra premium. Recommend taking it to a gun shop for appraisal.
Your browning sweet sixteen was made by FN of belguim for browning in 1957,with the serial numbe that you provided.
your browning sweet-sixteen with the serial number you provided was made by browning in belgium by FN in 1956.
That is not a Sweet Sixteen serial number.
Your browning sweet sixteen was made by browning in 1953.
your browning sweet sixteen was made in 1955.
your browning sweet sixteen was made in 1959.
Your browning sweet sixteen was made by browning in 1953.
With the serial number that you provided,your browning sweet sixteen shotgun was made by FN of belguim 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 shotgun was made by FN of belguim for browning in 1961.
your browning sweet sixteen with a 2s prefix was made in 1962.
Serial number s76529.The serial number S76529 indicates that your Browning sweet sixteen shotgun was made in the year 1957.