3) Colt M1911 British Contract: S/N W29117 to W97000 and S/N C29 to C74,200 = May 1912 to April 1919 (Approx. 17,500 pistols were shipped to England. Serial numbers that begin with a "C" were .45 ACP and serial numbers that begin with a "W" were .455 Webley calibers.
4) Colt M1911 British RAF Contract: S/N W91,100 to W110,696 = Jan. 22, 1918 to April 28, 1919 (Approx. 10,000 pistols were shipped to the Royal Air Force from this serial number range and were .455 Webley caliber.)
5) British M1911A1 WW II Lend-Lease: From all S/N's of U.S. M1911A1 models = March 11, 1941 through the rest of WW II ( The U.S. furnished 39,592 pistols to Britain through the Lend-Lease Act.)