Go to Browning's website under Support then go to Date your firearm. Value of any used firearm depends upon condition and area of sale.
Browning sweet 16 model s76727 value
100-1200 usd
You will need to conatact Browning and order a letter from them
100-350 USD
100-500 uSd
100-1000 usd
Not a valid Browning serial number.
500 USD
50-300 USd
Are we talking about a auto-5 shotgun,or a BPS(browning pump shotgun),or a over-under shotgun(citori, or superposed)These answers would help me determine the value of your shotgun which was made in 1980.
Based on description 100-500
70-700 usd