Breitling is regarded as being one of the preeminent brands for aviator watches, having been of the first watch companies to feature a slide rule on the dial of a chronograph. They first did this in the early 1940s on the Chronomat. The Navitimer was launched in 1952 and for years was the most important watch in its line-up. Still today, the Navitimer is used as a navigational aide by pilots and the watch has become a classic piece for chrono collectors. This is a special reference 815 known as the ‘LONG PLAYING’ STOCKHOLM CHRONOMETER’ TILLHÖR TELEVERKET’ for the Swedish telephone company.