"Flight-qualified by NASA for all manned space missions", the OMEGA Speedmaster Professional has the most impressive history of any watch in the world. After exhaustive testing, NASA issued the Speedmaster Professional to its Gemini and Apollo flight crews because of the Speedmaster Professional's reliability in all atmospheric conditions and for its manual-winding c.1861 movement which functions in the weightlessness of space. The Speedmaster Professional features a chronograph that can measure accurately down to 1/5th of a second. A tachometric bezel surrounds the shock-resistant hesalite crystal and permits the accurate measurement of speed
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