Lefaucheux M1858
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The Lefaucheux M1858 was a French military revolver developed for the navy, chambered for the 12 mm pinfire cartridge, and based on a design by Casimir Lefaucheux and his son, Eugene. The 1854 model was the first metallic-cartridge revolver... Wikipedia
Action: Single-action (military), double-action (civilian)
Cartridge: 12 mm Lefaucheux
Designer: Casimir and Eugene Lefaucheux
Feed system: 6-round cylinder
In service: 1858–present
Length: 280 mm (11 in)
Muzzle velocity: 168 m/s (550 ft/s)