50-500 usd
$1100
A few hundred to multiple thousands of USD depedning on EXACTLY what you have.
They range from 80 in bad shooting shape to over 300
Value depends on condition and exact configuration. Value range from a few hundred to multiple thousands of USD.
You could be in the 1000-10000 price range depending on specifics
If you mean a BERETTA, without more of a description, a broad range would be 100-1000 USD
A Browning over and under is worth about $1,000-1,500 on it own and the fact that it's a Belgium made Browing increases the price significanly. I would say somewhere in the range of $500 to $750 more. The belgium made Browning is the most collectible and popular.
The size of the wire is stated by its gauge under American Wire Gauge. Six gauge wire is size 6 AWG.
Assuming that's the serial number (you should generally XX out the last couple of numbers for privacy), you may be able to get Benelli USA to tell you when it was made. There is no published list of the numbers online. As to what model it is, it should say on it somewhere on the frame itself. Otherwise, you need to provide a description of it--pump, auto, single barrel, over/under--the gauge and length. Franchi makes or has made a huge variety of guns in many styles. You can try joining any firearms forum with a shotgun section and posting photos, too.
Assuming you mean the Silver II over/under shotgun imported by American Arms, they are selling in the $450 range in excellent condition. sales@countrygunsmith.net
The Savage model 440 over/under 12 gauge shotgun will range in price from 250-400 dollars depending on overall condition.These shotguns were made from 1968-1972.
Over/under, pump, semi auto? Age? Finish? Barrel length? Grade? Broad price range 300-5000 USD.