OK, I can't figure out the proofhouse serial number for the Trooper MKlll 58587L? Point me in the right direction. Thanks for the help guys , I wanted to edit the post and show some photos. I had a desire to visit a local pawn shop , that I frequent. Mainly because he takes in some classics on occasion. I found this one laying in the display case. 4" Colt Trooper MKlll nickel finish. I quickly asked to see it and went thru some function test of which it passed with flying colors. Made sure there was no flaking or missing nickel. I did find one side was pretty cloudy, possibly from being stored with that side down?? Anyway , I brought it home and went to work polishing the nickel cloudiness out with Mother Mag and Wheel polish. She turned out to be a good looking old Colt. I have some MKlll wood stocks coming but for now she's wearing rubber. Thanks for looking and feel free to post your examples if you like. Love to see Colt revolver photos and especially Troopers.