Since their release, the Rolex Cosmograph Daytona models were powered by three different mechanisms: the Valjoux 72 calibre (which developed in the following versions: 72B or 722, 722-1 and 727), the Rolex 4030 movement (based on the Zenith El Primero) and the current in-house Rolex 4130. These three mechanisms can be taken as an example of the mechanical chronograph’s development from the ‘60s up to the present days.
Let us begin with the reliable Valjoux manual winding chronograph, which was equipped with a column wheel and an horizontal clutch (the coupling yoke): the most logical choice for a watch producer in the early ‘60s. In 1969, the Swiss watch industry launched itself into the creation of an automatic chronograph. The match was won by Zenith, which released the first integrated automatic chronograph running at a high frequency of 36.000 oscillations per hour: the El Primero timepiece.
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