Re: Iver Johnson Pistol
first thing is this is not a 38 special the correct caliber is 38S&W. do not try to fire a 38 special in this revolver. the cylinder is to short and if you did suceed in getting a 38 special cartridge in the cylinder and firing it the cylinder and top strap would blow up in your face.
your revolver is an iver johnson's arms & cycle works large frame second model "safety automatic hammerless revolver". the second models were manufactured between 1896 and 1908 and were manufactured for BLACK POWDER CARTRIDGE PRESSURES ONLY THEY ARE NOT CONSIDERED SAFE WITH MODERN AMMO. your revolver was manufactured in 1903. the "I" letter code was used one the second model hammer version in 1903 and the hammerless models used the 'J" letter code that year. i have a hammer model with the "J" letter code so i guess a hammerless model with the "I" letter code is possible.
the standard barrel length for the large frame models is 3 1/4 inches, the standard finish is nickel and the grips are hard rubber. the second model has the highest production of in the safety automatic revolver. there are actually three models mnufactured between 1894 and 1941, with more second models manufactured than first and third combined.