In the USA, Between 1870 and 1900 there was a surge in firearm development and methods of mass production were also perfected.
Here are a few examples of civilian self-defense revolvers available to the public during the last quarter of the 19th century....
The next ad is for Colt's "New Line" Revolvers, of which I own one of the .32 cal. rimfire models. The .32 cal is the top right in the advertisement and the price was $11.