Pictured below is my Colt Model 1908 Pocket Hammerless circa 1922. It is chambered for the .380 ACP cartridge, holds 7+1 rounds and is a single action blowback design.
It is said that Al Capone kept one in his coat pocket and Bonnie Parker used one to break Clyde Barrow out of jail after smuggling it into the jail by taping it to her thigh. Bank robber John Dillinger was carrying this model of pistol when he was shot dead by FBI agents outside the Biograph Theater on July 22, 1934.
General George S. Patton also carried one during World War II, embellished with his rank of three stars.