Here are a couple variations of the 7mm pinfire revolver made by the Mariette family of gun-makers who lived in Cheratte, Liège, Belgium. This particular design was patented in 1862 by Servais Joseph Celestin Mariette, the son of the well known gun maker, Guillaume Mariette.

Across the Mariette family there were dozens of firearm patents registered and the designs often crossed over into patents by others in the family. There is also a lot of crossover when making the actual guns as well; for example, guns patented by Guillaume Mariette could be made and have a mark of his brother, Gilles Mariette.