I have a 1911 Colt made in 1918. It has almost all of the bluing gone from it except for some on the front of the slide. As if someone put it in an open bottom holster for a long time.It has some slight pitting in the top of the slide just ahead of the rear sight. It also is marked US PROPERTY on the left side of the frame just ahead of the trigger guard.There is rampant Colt pony is in the middle of the slide in between all the patent writing and dates.The serial # is 484978. There is some kind of proof mark above the mag release. This may sound foolish but it looks like a deformed triangle. Under it are B12,612,s12 one of those i can't tell my eyes aren't so good anymore.Help would be great here. As far as i know it is an original Colt 1911 pre WW2 but i don't know much about these old goverment models. Thanks 45automan