MARATHON WW194001 Swiss Made Military Issue Milspec Navigator Quartz Pilot's Watch with Tritium MIL-SPEC: Built to Government specifications for use by military personnel. Nato Stock Number 6645-01-364-4042 engraved on case back TRITIUM GAS TUBES: Self illuminating tritium gas tubes glow with no need to be charged by an external light source. PILOT'S WATCH: Designed for pilots and paratroopers. Features a lightweight high impact fibreshell case and domed acrylic crystal. HIGH TORQUE MOVEMENT: Swiss made ETA F06 3 jewel high-torque Quartz movement with EOL (End-of-Life) indicator for superior timekeeping and quality. Submersibility: 6ATM SWISS MADE: Marathon watches are proudly made in La Chaux de Fonds, Switzerland since 1939.