In tribute to the famous breitling datora watches which were bestsellers in the 1940s this chronograph with complete calendar is distinguished by its unique way of showing the date embodying an authentic demonstration of mechanical ingenuity its selfwinding movement displays the day and month in two side by side apertures while a half moon center pointer indicates the date around the dial in addition to the aviation slide rule a tachometer and a 1100th of an hour indication the montbri