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8) Colt/Springfield: S/N 128,617 to 133,186 = 1916 to 1924 ( These models are very hard to properly identify) 9) Colt: S/N 290,000 to 450,000 = May, 1918 to Oct. 24, 1918 to April 10, 1919 11) Springfield Armory: S/N 72,571 to 133,186 = April 1914 to April, 1917 12) Remington-UMC: S/N 1 to 15,000 = Aug. May 1917, 300 Colt 1911 .45ACP pistols purchased in 1915.