Iver Johnson's Arms & Cycle Works of Fitchburg, Mass produced this .22 caliber break top double action revolver as the "Safety Hammer" model from the 1890's until 1950.
Dimensions for the Iver Johnson .22 Break Top Revolver
Measuring right panel (vertical not diagonal)
2 9/32” long
1 1/32” wide across center of screw hole
31/32” wide across center of pin hole @ butt
