US MILITARY NAVIGATOR PILOT QUARTZ TRITIUM WATCH. Manufactured by Marathon. Model # NPQH3 National Stock Number NSN 6645-01-364-4042, Mil. Spec.# MIL-W-46374F, Type: Type VI Quartz. This general purpose quartz watch is the actual military issue product. It was used extensively in the Gulf War and is still manufactured under contract today. The tritium vial light sources do not use power from the watch battery - they are self luminous and allow readability in total darkness. Features of this most rugged and accurate timepiece are: Black Reinforced fiberglass Body with S.S. Back Plate, Bi-directional Rotating Bezel, Swiss made Heavy duty "full" quartz movement, HACK Second Hand, Water resistant to 6ATM. (196ft.), Heavy Duty Black Nylon Band, 1 Year Warranty. NEW.