1900's give or take a few decades
10-100 USD or so
0-150 USD or so
Cornell publications might have what you are looking for.
Depends on exact model and condition, but typically $125-$300.
The action is the heart of the revolver
@ turn of the century give or take a decade
Double action revolver
In decent shootable condition you are looking at a value around $150.
Depends on the revolver
the 'victor double action' series of revolver were marketed as a direct competitor to Iver Johnson's u.s. revolver co. double action (1910-1935).
a shotgun is pump action and a revolver "revovles" the ammo.