Oris watch big crown complication oris big crown complication is a watch for pilots that brags a number of useful complications the timepiece is equipped with oris 581 a modification of eta 26882671 the movement performs 28 800 vibrations per hour and has 17 bearing jewels a 38 hour power reserve is available for the convenience of the wearer hands and indices are covered with luminous paint for enhanced night time visibility the watch comes with a second time zone and a moon phase indic