Oris bc4 small second pointer day is a beautiful and functional modern interpretation of classical watches for pilots the timepiece is equipped with oris 645 automatic calibre a modification of eta 2836 2 the movement performs 28 800 vibrations per hour and has 27 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 the 9 oclock mark a date display is positioned