Fortis b 42 is a range of watches for pilots and as such these emphasize on readability in even the harshest of conditions the b 42 flieger automatic daydate is equipped with swiss made eta 2836 2 automatic calibre that performs 28 800 vibrations per hour and has 25 bearing jewels other movement characteristics include incabloc shock absorber and fine timing device hands numerals and indices are covered with luminous paint that improves night time readability a day and date window is posi