Oris bc4 small second pointer day is a modern interpretation of classical aviation timepieces the watch 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 subsidiary seconds appear at the 9 oclock mark a date display is located at 3 oclock hands and indices are luminous for improved night time visibility additional usefu