Well, I just inherited my Grandad's Colt 1911. It's stamped Model of 1911 U.S. Army on one side of the slide and above the trigger it's stamped United States Property with serial number 539XXX below it. So far, all I can find about it is that Colt made this particular gun sometime 1917-1918. Apparently my grandfather had it chromed. I know that's reduced the value. Any additional info on this would be greatly appreciated!!!