Set sail with confidence and style to points unknown with this classic Omega Seamaster stainless steel men's quartz chronometer watch, a highly accurate timepiece that's as comfortable negotiating deals in the boardroom as it is navigating the breaking seas. It's also a great diving watch, with water resistance to 300 meters (1000 feet) and a helium escape valve, which allows helium to escape from inside the watch when the watch is worn in highly pressurized environments (such as long-term underwater work or crude oil exploration). Definitively masculine in design, it features a large, round silver stainless steel watch case that blends brushed and polished surfaces and measures 41mm (1.61 inches) wide and 11.5mm (0.45 inches) deep. But Omega is more than just a fashionable watch. In 1965, the Omega Speedmaster chronograph was "flight-qualified by NASA for all manned space missions" as the only wristwatch to have withstood all of the U.S. space agency's severe tests, including passing grades for extreme shocks, vibrations, and temperatures ranging from -18 to +93 degrees Celsius. The greatest moment in the Speedmaster's history was undoubtedly 20 July 1969 at 02:56 GMT, when it recorded man's first steps on the Moon's surface as part of the Apollo 11 mission. Today, Omega is known for its rigorous testing of new movements, cases, and bands. Each new Omega movement is tested on the wrist in existing Omega models, while various laboratory tests are conducted to determine temperature-resistance, shock-resistance and vibration-resistance.