It looks to be an H&R " The American Double action ", 850, 000 made between 1883 and 1940, however it was not until 1905 that H&R went to a stronger ' smokeless ' frame. To differentiate the difference frames, H&R roll marked the caliber on the barrel. So, if it has the caliber markings, it is smokeless, if no caliber markings then black powder. This gun was also chambered in .44 center fire, so I think it will hold up to a .32 S&W Long Cartridge ( The proper black or smokeless of course ). Now I can not nor will give anyone advise on firing a old gun I can not hold in my hand and examine for myself. Now having stated that, I have fired a lot of smokeless 32 S&W shorts in my old guns. The ..32 short is a low pressure round { kept that way because of the many old guns still working }, in fact the pressure level is the same as the black powder round. The difference is the pressure curve between the two, a few rounds of .32 short, if you can find it ; will not blow up the gun, but if fed a constance diet of smokeless, the frame will stretch, the hinge will loosen and the cylinder will get out of time. Just my HO.