The serial number prefix 1S was assigned to the browning sweet sixteen model of the auto-5 shotgun in the year 1961,So yes you have a Browning sweet sixteen shotgun.
Your browning sweet sixteen was made by browning in 1949.
Your browning sweet sixteen was made by browning in 1964.
Your browning sweet-sixteen was made in 1954.
your browning sweet sixteen was made in 1953.
You will have to call Browning
Your browning sweet sixteen was made by FN of belguim for browning in 1951.
With the serial number you provided,your browning sweet sixteen was made by FN of belguim for browning in 1955.
With the serial number that you have supplied,your Browning Sweet sixteen was made in Belgium for Browning in the year 1956.
your browning sweet sixteen was made in 1952.
Your browning sweet sixteen was made by FN for browning in 1926 with the serial number you provided.
With the serial number that you provided,your Browning sweet sixteen shotgun was made for Browning in the year 1953.
The 1S prefix to your serial number indicates that your Browning Sweet sixteen shotgun was made by FN of Belguim for Browning in 1961.