In the 1950's and 1960's, several manufacturers supplied chronograph wristwatches to the French military forces. These were originally designated Type 20. After a period, it became expensive to maintain and repair these watches and a new series was introduced using more modern movements, the Type 21. One of the French Defense Ministry's requirements for the Type 20 and Type 21 was the flyback (retour en vol ) function. The flyback is also called the "Taylor system" or "permanent zero setting." The flyback ...

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