First place to try would be a local gunshop.
A Browning Sweet Sixteen shotgun that was made in Belgium can be found for sale at GunBroker.com,or auctionarms.com,both of these sites generally have them listed for sale.You may also browse the local gun shops in your area.
Browning sweet 16 model s76727 value
browning sweet sixteen serial number 5s43804 what year was it manufactured
Not a valid Browning serial number.
Before the 1950's.
50-600 uSD
50-500 usd
Your browning sweet sixteen was made by browning in 1959.
Your browning sweet sixteen was made by browning in 1953.
55-550 usd
Your browning sweet sixteen was made by browning in 1953.
Your browning sweet sixteen was made for browning in 1922 by FN of belguim.