The watch is a beautiful and practical addition to the oris bc4 collection it is both resilient and legible qualities that all aviation watches need to possess oris bc4 small second pointer day is equipped with oris 645 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 9