Oris watch big crown small second pointer day practical and beautiful oris big crown small second pointer date is the perfect aviation timepiece 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 hands and indices are luminous for improved night time visibility a date display is positioned at the 3 o clock mark