Hopkins and Allen made several pocket sized break top revolvers in .32 and .38 S&W calibers from the 1880's through the early 1900s when the brand faded away.
I did some digging on one I got from my Dad a few years ago. His is a nickel plate 5 shot in .38 S&W, (not .38 Special). It's a real New Orleans pimp gun with a shiny black grip and that nickel plate.
They were mid to low priced guns and the police referred to them as "Suicide Specials" because they were so inexpensive that people bought them for that purpose.
The sights on mine are pretty poor and tiny and based on putting a few rounds through it, if I want to hit someone between the eyes I'd have to point it at his right foot.
I'd keep it, shoot a few rounds through it, in the correct caliber and put it away as a collector's item. DO NOT depend on it for home or personal defense.