- koimaster (Online)
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Since 1969 and the release of the very first model, the El Primero chronograph has held a prominent role within Zenith's portfolio. It makes total sense too, since this automatic high-beat chronograph caliber represented a crucial step in watchmaking history, achieving, after many years of research, what was deemed almost impossible. The very same year Seiko and a Swiss conglomerate also released an automatic chronograph movement, but neither was high-beat, a characteristic which allows better measurement of the elapsed time, given the higher frequency of the caliber. The El Primero was not only used by Zenith, but was also adopted by Ebel and Rolex in the 1980s and 1990s (despite almost disappearing entirely at one point). To this day, it still remains the core of Zenith, which offers the chronograph in three case sizes, the original 38mm, 42mm, and 45mm.
https://www.hodinkee.com/articles/zenit ... 1cc48dd36b
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