This article will take a look at some of the smallest pinfire guns and cartridges. The 2mm pinfire cartridge showed up around 1880. This is when Société Française des Munitions began producing the variations shown in the following factory drawing.
These cartridges were made for tiny pinfire revolvers that looked like miniature versions of the normal pinfire revolvers. The following image is an example of one sold by Wayne Driskill Miniature Firearms.