Oris Watch Big Crown X1 Calculator. The first manned supersonic flight took place in 1947. Oris Big Crown X1 Calculator is inspired by this event. The timepiece is equipped with Oris 675 automatic calibre, a modification of ETA 7750. The movement performs 28 800 vibrations per hour and has 25 bearing jewels. A 42 hour power reserve is available for the convenience of the wearer. Hands and indices are luminous for improved night time visibility. The chronograph of the watch comes with a 60 second, a 30 minute and a 12 hour register. Day and date displays are available, as well. Oris Big Crown X1 features a historically accurate slide rule. Additional useful characteristics include screw in security crown, see through case back and scratch resistant sapphire crystal glass with anti reflective coating,e�e�Case is Multi piece stainless steel case, grey PVD plated.
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