I have a New Service (Colt) U.S. Army Model 1917 Revolver with pearl handles and a 7/12 in barrel. I have not shot it, but appears to be in fireable condition. Appears to be 45 acp which would require half moon clips (which I do not have). U.S. Army serial number on butt is 46956 which based on a search indicates was manufactured in 1918. Serial number on frame 198063 indicates manufactured by Colt in 1919.