sentences:  Colt listed it in their annual catalog until existing parts were used up in the early 1920s.Production of the Model 1903 Pocket Hammer Model, basically just a short-barreled 1902 Sporting Model, began in earnest in 1904 (only one hundred pistols seeing production in 1903) with production varying from about 1,200 to 2,300 each year until 1917 when production curtailed sharply due to World War I.Up to late 1907, rounded stub hammers were used, but Colt, with the interest of the military and apparently the public now set on low profile spur hammers (due to that requirement on the Model 1907 US test pistols, these being modified Model 1905s with grip safeties), started phasing in low profile spur hammers on all their exposed hammer automatics that they were continuing in production