A professional watch for divers needs various safety features as well as extreme resilience and legibility oris divers small second date has all these features the watch is equipped with oris 643 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 indices and bezel elements are luminous for improved night time visibility a date display is pos