What is the value of an Iver Johnson 22 Supershot Sealed Eight Pistol?

Iver Johnson Supershot Sealed 8 .22 LR 8 shot break open revolver, adjustable sights, checkered wood grips, mfg. 1931-57. Values range for $175 at 100% condition (i.e., new in box)$110 at 90%, $90 at 80%, $85 at 70%, and 75$ at 60%. The first course of action to discern the value of a gun is to identify the make, model, manufacturing date, and variation. The book "Iver-Johnson Arms & Cycle Works Firearms 1871-1993" by W. Goforth will accomplish this. Then it's a simple matter of looking your gun up in one of the many firearm value books, such as the Blue Book of Gun Values, or the Standard Catalog of Firearms.