Here’s mine on the S-A “loaded” 1911A1. Government Model .45 ACP (Commercial) Thuer Third Model Derringer 41, The Rampant Horse and Colt logos are registered ), 37) Ithaca: S/N 900,001 to 914,000 = 1943, 38) Ithaca: S/N 914,000 to 916,404 = 1943, 39) Ithaca: S/N 1,208,674 to 1,279,673 = 1943, 40) Ithaca: S/N 1,441,431 to 1,471,430 = 1943, 41) Ithaca: S/N 1,816,642 to 1,890,503 = 1944, 42) Ithaca: S/N 2,075,104 to 2,134,403 = 1945, 43) Ithaca: S/N 2,619,014 to 2,693,613 = 1945. S/N C106000 to C120999 – 1919 – 15,000 The Coltautos.com logos and all proprietary artwork and photos are the property 4) Colt Service Model “ACE” : Caliber .22 Long Rifle S/N SM 1 to SM 3,836 = Feb. 1936 to Jan. 1943 ( Between 1935 and Sept. 1945, 11,961 Colt Service Model “ACE” pistols were made and their parts were fully interchangable with the .45 caliber Simply go to the Colt homepage and hover your mouse to the “Customer Service” tab. S/N 253180C to 259549C – 1952 – 6370 S/N C213905 Oct. 8, 1942 Shipped to J. Coltautos.com Recommended References from Tried Colts serial No. New Army & New Navy S/N C145000 to C150999 – 1926 – 6000 Colt's Model 1911 .45 ACP different examples of early roll markings and US Army Ordnance inspection marks. Let me know, Get your Colt. Model 1909 .45 ACP Some special orders made for military or military contractors. Model). 5) Colt Service Model “ACE” : S/N SM 3846 to SM 13,803 = April 1945 to Sept. 1945 ( Between 1938 and Oct. 1946, a total of 2149 .22-.45 conversion units were made to convert .45 caliber pistols to .22 caliber. 20,000 to 83,856 = Jan. 1913 to Aug. 19, 1913, 5) Colt: S/N 83,856 to 89,801 = Aug. 19, 1913 to July 20, 1914, 6) Colt: S/N 89,801 to 108,601 = July 20, 1914 to Feb. 8, 1915, 7) Colt: S/N 108,601 to 290,000 = Feb. 8, 1915 to May, 1918, 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, 10) Colt: S/N 450,000 to 629,500 = 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. 10, 1918 to May 24, 1919, 13) Remington-UMC: S/N 15,000 to 21,676 = Aug. 10, 1918 to May 24, 1919, 14) North American Arms: S/N 1 to 100 & S/N’s 111, 222, 333, 444, 555 = July 1, 1918 to Dec. 4, 1918. S/N 70G73001 to 70G88900 – 1975 – 15,900 M1911 and M1911A1 Pistols, History and Development of the M1911/M1911Al Pistol, M15 General Officers Model .45 Caliber Pistol, Norwegian M1911 Pistols, Models 1912 and 1914, Some MEU’s still carry proven M1911 .45’s, T. E. Lawrence (Lawrence of Arabia) and the M1911, The Evolution and Development of the Colt Commander, The Randall Firearms Company History 1983-1985, The Commercial Colt Caliber .45 Government Model Manual – Cover, If You’re Serious, Get a .45! S/N 332650C to 336169C – 1970 -3520 Model, S/N 209,587 to 210,386 U.S.M.C. distributed without expressed written permission. 6,575 Commercial models were converted to military production. Colt stop it’s commercial production at S/N C215,083), 24) Colt: S/N 1,609,529 to 1,743,846 = 1944, 25) Colt: S/N 2,244,804 to 2,380,013 = 1945, 26) Remington Rand: S/N 916,405 to 955,000 = 1943, 27) Remington Rand: S/N 955,001 to 980,000 = 1943, 28) Remington Rand: S/N 980,001 to 995,000 = 1943, 29) Remington Rand: S/N 995,000 to 1,041,404 = 1943, 30) Remington Rand: S/N 1,279,699 to 1,441,430 = 1943, 31) Remington Rand: S/N 1,471,431 to 1,609,528 = 1943, 32) Remington Rand: S/N 1,743,847 to 1,816,641 = 1944, 33) Remington Rand: S/N 1,890,504 to 2,075,103 = 1944, 34) Remington Rand: S/N 2,134,404 to 2,244,803 = 1945, 35) Remington Rand: S/N 2,380,014 to 2,619,013 = 1945, 36) Ithaca: S/N 856,405 to 900,000 = 1943 ( S/N’s 856,101 to 958,100 were duplicated by Colt, look for “G.H.D.” or “W.B.” Colt inspection initials. 1911 made by Argintina under licence from Colt marked on right of slide with “ EJERCITO /... 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