Colt Model 1908 Vest Pocket pistol chambered in .25 ACP, a compact, semi-automatic firearm designed by John Browning. It was marketed as a highly concealable self-defense pistol, small enough to fit into a vest pocket. Design: A small, 4.5-inch overall length, 13-ounce, "hammerless" (internal striker-fired) pistol.Action: Semi-automatic, single-action with a direct blowback mechanism.Safety Features: Noted for its advanced safety features for the time, including a grip safety and a manual slide-locking safety catch. Later models also included a magazine safety disconnector, preventing firing with the magazine removed.Production: Manufactured by Colt's Manufacturing Company from 1908 to 1948