- BC4 and BC3 - Oris BC4 Flight Timer Leather (OR-681)
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Oris BC4 Flight Timer, just as its name suggests, is a functional and resilient aviation timepiece. The watch is equipped with Oris 690 automatic calibre, a modification of ETA 2836-2. The movement performs 28 800 vibrations per hour and has 30 bearing jewels. A 38-hour power reserve is available for the convenience of the wearer. Hands and indices are luminous for improved night time visibility. Oris BC4 Flight Timer displays two time zones simultaneously. The second one is indicated through a sub-dial at 3 o'clock. Subsidiary seconds appear at 9 o'clock. The date window is positioned at 3 o'clock. Additional useful features include automatic winding worldtimer developed by Oris, Oris Quick Lock security crown, see-through case back and scratch-resistant sapphire crystal glass with anti-reflective coating.
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