Zenith El Primero Rainbow Flyback

Zenith’s El Primero automatic chronograph caliber — unveiled to the world just over 50 years ago, in 1969 — is regarded as one of the world’s best and most accurate movements. In this historical feature from the WatchTime archives, contributor Thomas Gronenthal takes a look at its development.

In Switzerland, toward the end of the 1960s, two coalitions of watch manufacturers were hard at work developing the world’s first automatic chronograph movement. A leading role was played by Breitling, which collaborated with Heuer-Leonidas, Hamilton/Büren and Dubois Dépraz to develop a micro-rotor caliber that was unveiled simultaneously in Geneva, New York, Hong Kong, and Beirut in March 1969. In Japan, Seiko was working on its own automatic chronograph movement, Caliber 6139, which was introduced to the Japanese market in May 1969. But Zenith and its partner Movado had managed to publicly announce the development of an automatic chronograph movement and show a working prototype at a press conference in Geneva on Jan. 10, 1969, calling its new watch the “El Primero” (meaning “the first”).

Zenith El Primero Rainbow Flyback

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