Bell ross watch ww2 by creating the vintage ww2 regulateur heritage wrist watch 2 bell ross pays tribute to the timekeeping instruments used by bomber navigators in the 1930s and 1940s the bell ross watches vintage ww2 observation watch emphasizes the minutes display essential for aviators in calculating their position or fl ight speed the modern version of this functional and historical model possesses the ergonomics and immediate legibility of a navigators watch