The 903 is a classic navigation chronograph a limited edition timepiece that will appeal mainly to collectors and connoisseurs this watch is equipped with lemania 1883 hand wound movement that performs 21 600 vibrations per hour and has 17 bearing jewels various useful functionalities come with this professional pilots watch it has a moon phase display an interior bezel with logarithmic scale hand date electroplated and uv resistant dial a second time zone a slide rule function a date