I am trying to date a Colt NM which I may be purchasing but have not had any luck this far....It is a blued National Match SN: 1202xNM(side of frame). The front stap is serrated and so is the enhances lightened slide(rolled National Match on slide). I has Accro sights and a blued steel kidney cut trigger with adjustment screw.I seems to be all original(down to the sear gadget thing for trigger bounce) but the finish is about gone and some rust pits. I is poliished on the flats of frame and slide.Any help will be welcome...Thanks ROFI