100-400 usd
500 USD
100-10000 USD depending on exactly what you have, condition, etc..
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.
Sweet Sixteens, whether Belgian or Japanese, in original excellent condition, are bringing over $1000.
The value of a Savage shot barrel 12 gauge single trigger shotgun depends on its condition. This gun in excellent condition is valued between 450.00 and 550.00 as of 2014.
A Browning automatic light 12 gauge shotgun with a gold trigger is worth between $300 and $1,000. The actual value varies greatly based on the specific model and its overall condition.
375-550 dollars, depending on overall condition of your shotgun.
100-500 uSd
Assuming you have an Auto-5, anywhere from $400-$1500. Have it properly identified and evaluated.
The Browning light 20 which was introduced in 1958 is selling for between 460-650 dollars for a shotgun with between 60%-90% original condition and a good bore.
400 or so
50-500 usd