If that is the entire serial number, it was made in 1939. Value would depend on whether the gun is original or not, and its condition.
browning sweet sixteen serial number 5s43804 what year was it manufactured
Not a valid Browning serial number.
Browning sweet 16 model s76727 value
Before the 1950's.
50-600 uSD
checkered stock, gold trigger, receiver engraving, and price.
50-500 usd
55-550 usd
You can purchase browing gun parts directly from Browning's warehouse and repair facility in Arnold, Missouri.
I don't think Browning can modify trigger pull on their rifles due to liability, but you can contact a retired Browning Gunsmith who does excellent work on pull.
See the link below
Gold plated. Less than 1/10 of an ounce