You will need to call Browning.
1969
Browning's web site has a sn search function.
your browning sweet sixteen was made in 1955.
With the serial number that you provided,your Browning Sweet Sixteen shotgun was made by FN of Belguim for Browning in the year 1949.
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.
With the serial number that you have provided,your Browning Sweet Sixteen auto-5 shotgun was made in Belgium for Browning in the year 1957.
You did not provide a serial number. You will have to call Browning.
With the 3S prefix to your serial number,I can say that your browning sweet sixteen was made in 1963.
With the serial number that you have supplied,your Browning Sweet Sixteen model auto-5 shotgun was made in Belgium for Browning in the year 1953.
No serial number given.
With the serial number that you have supplied,your Browning Sweet sixteen was made in Belgium for Browning in the year 1956.