Iver Johnson Pistol Age?

Your Iver Johnson was made the second year of production of this model,1901. Serial numbers in 1901 went from 12001 through 23000. After a hundred and so years the metal and springs are very prone to breakage and there are no parts and few gunsmiths will work on them, it is best to retire it to a place of honor on the wall. It was made during the black powder era, so if it were mine and I wanted to shoot it a few times, just to see if it shoots, I would acquire some low power " CB " shorts. The CB shorts contain no powder and are propelled by only the primer. They are a hoot to shoot and should not harm your gun, as pressure is almost non existent. Hope that helps.