walter is correct in the chain of events just off a little as to the year. iver johnson arm's & cycle works introduced the u.s.revolver co. handguns in 1910 and discontinued them in 1935. production of the top break .22 rimfire and the hammerless .32 and .38 versions were stopped earlier.
yor revolver a u.s. revolver co. automatic (top break)small frame hammerless serial number b19119 was manufactured in 1921, there were 2,500 of these models manufactured that year. your revolver is chambered for the .32 s&w (short) and as long as it is in good shope you should not have any problems with modern ammo,just remember its age.
the u.s. revolver co. automatic small frame hammerless .32 s&w caliber was in production from 1910 until 1923 with a total production of 141,900.