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Zenith el Primero A386
The Zenith el Primero A386 was the first commercially released automatic chronograph.
In 1969 three automatic chronographs were introduced: the Zenith El Primero, the Seiko 6139, and the Caliber 11 . To this day, it is disputed as to which of these aforementioned brands launched first. However, what we can determine is that Zenith produced one of the first two integrated automatic chronographs ever…