And to make things even more challenging, the beating frequency of the chronograph had to be high enough to make it the most accurate chronograph wristwatch in the world measuring 1/10th of a second.
Instead of considering the easier option to add a chronograph module to a base movement, Zenith had a more ambitious plan: the chronograph function had to be fully integrated within the mechanism and actuated by a column wheel rather than by an easier-to-implement cam. In 1962, Zenith began developing the idea of creating the first automatic chronograph in watchmaking history with the ambition to launch it in 1965, on occasion of the centenary of the Manufactury. While automatic movements for “solo-tempo” or three-hand watches started becoming popular in the 1940s and 1950s, no automatic chronograph movements had been manufactured yet. After the First World War Zenith began with the development and manufacture of wristwatches, including alarm and chronograph functions. These successes accelerated the growth of the company which was transformed into a stock company in 1911. Over the years, Zenith won many more competitions achieving the impressive record of more than 2,300 prizes considering pocket watches, on board instruments and wristwatches Founded in 1865 in Le Locle by Georges Favre-Jacot, Zenith quickly earned a reputation as the manufacturer of some of the most precise timepieces of those years achieving the first prize in the chronometry competition of the observatory of Neuchâtel in 1903.
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