Type Semi-automatic pistol Place of origin United States Production history Designer John Browning Manufacturer Colt Patent Firearms Manufacturing Company of Hartford, Connecticut Produced 1903–45 No. built ~570,000 Specifications Mass 24 oz (680 g) Length 7 in (180 mm) (Type I)6.75 in (171 mm) (Types 2 – 5) Barrel length 4 in … Continue reading Colt Model 1903 Pocket Hammerless