Oris bc4 small second pointer day is a modern interpretation of traditional watches for aviators it is equipped with oris 645 automatic calibre a modification of eta 2836 2 the movement performs 28 800 vibrations per hour and has 26 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 subsidiary seconds appear at 9 oclock the date display is located at 3 oclock a hand and a scale around t