I was armed to the teeth with a pitiful little Smith & Wesson’s seven-shooter, which carried a ball like a homeopathic pill, and it took the whole seven to make a dose for an adult. But I thought it was grand. It appeared to me to be a dangerous weapon. It only had one fault—you could not hit anything with it. One of our “conductors” practiced awhile on a cow with it, and as long as she stood still and behaved herself she was safe; but as soon as she went to moving about, and he got to shooting at other things, she came to grief.
–Mark Twain, Roughing It
According to Wikipedia, the source of all vaguely accurate (and a lot of inaccurate) information, the events of Roughing It took place between 1861 and 1867. So it is likely that Twain’s “pitiful little Smith & Wesson’s seven-shooter” was something very much like this:
That’s a Smith and Wesson, Model 1, Second Issue.