Here’s an interesting look into what double barrel shotguns used to cost. Back in 1951, Abercrombie & Fitch’s store on NYC’s Madison Avenue carried all types of side-by-side shotguns, from Purdey to Parkers. They also sold Winchesters and Francottes. This ad shows what those guns cost. From the ad:
Winchester Model 21 Shotgun: An outstanding American-made shotgun noted for its dependability and balance. Factory tested with excessive load proof charges. Standard Grade. 12 to 20 gauge in various barrel lengths and borings: $329.20
Francotte Shotgun: In durability and beautiful balance, these guns are in a class by themselves. Hand made by August Francotte et Cie. of Belgium. Grade 14, 12 to .410 gauge in barrel lengths from 26″- 30″. $550.00
Today, the prices on these guns are a little higher. Here are two listed as being in excellent condition.