“The Apache Revolver is the Swiss Army knife of guns. Designed in the early 1900’s by the french gang Les Apaches this weapon was easily concealed and it is said that one bullet would always be left out of the chamber so as to not shoot yourself while it was in your pocket. Its range was very limited due to its lack of a barrel but it was an effective tool due to everything it could do, this weapon could shoot, cut and hit and could be easily folded up and placed in your pocket. Sheer Genius.”
The Wikipedia entry contradicts that description. This multi-purpose weapon was presumably designed by Louis Dolne of Belgium in 1860, went into production in 1869, and was discontinued by 1900. Here’s a quick video.