Re: IVER JOHNSON PISTOL
Welcome to TFF. Normaly more detail would be needed but in your case that letter code was used only for the .32 s&w cal. 1906 Second Model, Fifth Variation: "Small Frame Safety Automatic Hammer Revolver". Designed for black powder cartridges. Standard was a nickle finish with 3" barrel and hard rubber grips. Blueing was optional as was different barrel lengths and different grips.