The Marathon Divers Automatic WW194006 is a dive watch built to ISO 6425 standards. Designed for use by Search and Rescue (SAR) divers, and issued to the United States Marine Corps, the Divers Automatic is a watch built to withstand the most extreme of conditions The Diver's Automatic is also known as the Government Search and Rescue (GSAR). The watch is water resistant down to 30 ATM - 300 meters (1000 feet) underwater. Built from 316L surgical grade stainless steel, the Divers Automatic is a high quality, purpose built watch that will reliably accompany you on any adventure you may embark on. The Divers Automatic uses a scratch resistant, sapphire glass crystal. The Divers Automatic is made in La Chaux de Fonds Switzerland to guarantee the highest level of quality and accuracy in manufacturing. Inside the Divers Automatic is a Swiss made, 25 jewel ETA 2824-A2 automatic movement, the Divers Automatic guarantees you a reliable and accurate timekeeping experience. The Divers Automatic uses self-contained Tritium gas tubes to ensure constant visibility in low light situations, a gas tube is placed on each hour marker and hands and uses MaraGlo for the 12 hour bezel marker. Tritium tubes are self illuminating gas tubes which contain an isotope of hydrogen, meaning they will not dull down in brightness like normal photo luminescent paint which requires an external light source to create a glow. The Marathon Divers Automatic combines Military toughness with Swiss craftsmanship in a watch that will get the job done, and look good doing it. Comes with original rubber strap, currently wearing and gray NATO strap. Comes with a zippered case. Has some scratches, has been worn, otherwise good condition.