$325 new.
The best shotgun shell for shooting ducks is a 3 to 3 1/2 inch 12 gauge with number 2 shot.
50-400 usd
100-300 usd
100-500 USD
full choke
Gun shop, gun show, pawn shop, armslist.com
@500 each
My Franchi 20 ga O/U is modeled on the Falconet.
100-600 usd
100-300 USD
A Browning Ducks Unlimited 12G in perfect condition is worth $1100-1400 That's what the last six got sold for. It's a truly beautiful shotgun. The rusty ones at pawn shops sell for $500+.
If it is unfired, there is a slight premium over the value of the base shotgun.