Beretta 1S Flare Pistol
The BERETTA 1S is a signal pistol, standardly used by all Italian Armed Forces, firing 1 Inch flares. It feeds from a single-shot, top-break opening barrel. It can also be modified for use at sea, to launch fishing reels (this version is called 1S-LANCIASAGOLE, where LANCIASAGOLE means "Fishing Reels Launcher").
Photo and information from: PIERANGELO TENDAS