The value of your 1961 made sweet-sixteen is going for between 425-950 dollars if it is a plain barrel model,if it has a vent-rib barrel they are going for between 675-1650 dollars depending if it has about 60% original finish or 90% finish in pristine condition.
The 1S prefix dates your browning sweet sixteen shotgun to the year 1961.
What_is_the_value_of_a_Browning_Sweet_Sixteen
made in 1961. Check the link below for values http://wiki.answers.com/Q/What_is_the_value_of_a_Browning_Sweet_Sixteen
This gun was made in 1961
50-500 usd
The 1S prefix dates your Browning sweet sixteen shotgun to the year 1961.
Impossible to answer without a detailed description of all markings, features, box, papers, accessories, etc..
Proofhouse.com has sn data
Browning.com has sn data under customer service.
The 1S prefix to your serial number indicates that your Browning Sweet sixteen shotgun was made by FN of Belguim for Browning in 1961.
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.
According to http://www.browning.com/customerservice/dategun/detail.asp?id=13, the sn you list does not exist. Look at it again, it makes a difference in determining value. i dont think the 1 belongs there. the s in the serial number means that it is a sweet 16. if the rest is an accurate number it was produced in 1956.