![]() ![]() ![]() Second, in lateral-clutch chronographs, sometimes the drive wheel engages the chronograph seconds wheel so that they mesh tooth to tooth. If you are going to leave your chronograph on for 12 hours, it is very important that it keeps time accurately throughout this period. The civilian version of this watch features a 12-hour totalizer. He states, “To begin with, a vertical-clutch chronograph can be left running all the time with no negative effect on the balance’s underlying amplitude. As such, the flyback is always a function that is present in almost every Breguet Type 20 watch as it is the very core complication for this model.”įor chronographs, there are two different clutch systems, lateral and vertical.A Marca has selected the latter here because of its performance advantages. The idea that a simple activation of the pusher at four o’clock would allow an instant stop-reset-start sequence was invaluable. “Imagine a pilot wearing thick sheepskin gloves in the cockpit waiting to hear a radio signal to calculate his ideal route. “Being able to instantly start a new timing proved very useful, in particular to aviators navigating by dead reckoning,” says a Marca. ![]() ![]() Chronographs allowed pilots to calculate distances and plot their trajectories while in flight a flyback chronograph had the added advantage of combining the stop, reset and start actions into one function. Amongst various requirements was the retour en vol or flyback function. In the early 1950s, the French Ministry of the Armed Forces drew up specifications for the military procurement of a large quantity of chronographs for its Air Force, a watch intended to be worn on the wrist by both pilots as well as navigators that became known as the Type 20. ![]()
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