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Stainless steel case with a stainless steel bracelet. Fixed black ion-plated bezel with tachymeter. Black dial with luminous hands and stick hour markers. Minute markers around the outer rim. Luminescent minute markers around the outer rim. Chronograph - three sub-dials displaying: 60 seconds, 30 minutes and 12 hours. Manual winding chronograph movement. Scratch resistant sapphire crystal. Skeletal case back. Case diameter: 42 mm. Case thickness: 14.3 mm. Double locking deployment clasp. Water resistant at 50 meters / 165 feet. Functions: hours, minutes, seconds, chronograph, tachymeter. Omega Speedmaster Professional Chronograph Moon Watch 3573.50. The Omega Story The Omega watch story begins in 1848, when founder Louis Brandt began hand assembling key-wound precision pocket watches from parts supplied by local craftsmen in his principality La Chaux-de-Fonds, in the northwest corner of Switzerland. However, the Omega name didn't appear until 1894, after Louis Brandt had passed away and his watchmaking traditions were taken over by his sons, Louis-Paul and Cesar Brandt. Omega watches have long been associated with glamorous screen and sports stars--the Omega Seamaster is famous for being the watch of choice for James Bond--with current ambassadors including Pierce Brosnan, Nicole Kidman, tennis player Anna Kournikova, and swimmers Michael Phelps and Ian Thorpe. 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.