Requires professional appraisal.
The value of your Browning Sweet Sixteen auto-5 shotgun round knob can not be determined without you giving a detailed description of the shotguns overall condition including the condition of the bore.
There should be a number in front of the S. without it I cannot date it.
In order to give you a accurate value please include the serial number to date your sweet sixteen shotgun along with the overall condition,and what type of barrel that your shotgun has (plain barrel,solid matte rib.or vent rib barrel).
your browning sweet sixteen with the 5s prefix dates this shotgun to 1965.as to value there are to many condition and varying deluxe features that would add or subtract from the value.I would have a look at s p fjestads blue book of gun values to get a correct value amount.
your 1953 browning sweet sixteen if it has a plain barrel would be worth between 500-950 dollars depending on condition,if it has a vent-rib barrel it would be worth between 775-1300 dollars again depending on condition.
Your shotgun was made inÊ1965. In 95% condition it could be worth $1500, more if it has a ribbed barrel and open choke.
This gun was made in 1975, the last year of production for A5s in Belgium. Use the link below for value. http://wiki.answers.com/Q/What_is_the_value_of_a_Browning_Sweet_Sixteen