Here is a picture of mine. It was manufactured on Oct. 11,1918 and shipped to Bush Terminal Brooklyn, NY on Oct. 15, 1918. The serial number is 483354.
I have gone through it pretty thoroughly and all the parts seem to be original to include the barrel with the combined "H" and "P" marking. Although, who can tell if they are all from the same pistol as it left the Colt assembly line in 1918. One indication is the coloration of the major parts. Many of these were considered "Black Army" guns due to their black color in the blueing process which was caused by a change for cost consideration and faster production.
A good reference publication is "Collector's Guide to Colt .45 Service Pistols Models of 1911 and 1911A1" by Charles W. Clawson.