Colt M1991a1 Commander Serial Number Lookup: What You Need to Know Before Buying or Selling a Colt P

2) Colt M1911A1 Canadian Contract: S/N 930,000 to 936,000 = 1943 ( 1,515 military model pistols were shipped to Canada through the Lend-Leased Act from this serial number range.) Caliber .45 ACP

Colt M1991a1 Commander Serial Number Lookup

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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.) 2ff7e9595c