What is the manufacture date of a Colt 45 New Service Revolver SN 41905?

The Colt New Service revolver with serial number 41905 was manufactured in 1917. Colt's records indicate that the New Service model was produced from 1898 to 1944, with this particular number falling into the World War I production era. For precise details, you may want to consult Colt's official records or a reputable firearms historian.