This is the M1917 New Service that was made in 1919. It is a .45 ACP with a 5.5' barrel and the original wire brushed blued finish. Following is a list of the markings on the revolver. Stamped with 'United States Property' under the barrel and 'H' where the barrel meets the frame, 'Colt D A 45' on the left side of the barrel, and 'Colt's PT FA MFG CO, HARTFORD, CT, USA' and 'PAT'D AUG 5, 1884, JUNE 5, 1900, JULY 4, 1905'. Serial number inside the cylinder crane is 190XXX with a 1 below it. Above the cylinder release there is stamp of an eagle with 'S/5' below it. Bottom of the handle is the stamp 'U.S. ARMY MODEL 1917' and 'No 143XXX'. '3' stamped on the left side rear of trigger guard. $800 Cash.