![]() ![]() In Japan, Seiko was working on its own automatic chronograph movement, Caliber 6139, which was introduced to the Japanese market in May 1969. 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 Switzerland, toward the end of the 1960s, two coalitions of watch manufacturers were hard at work developing the world’s first automatic chronograph movement. But it’s much less common for a watch movement to gain fame and, after more than 50 years, achieve legendary status. It’s not uncommon for a watch to become a classic. ![]() In this historical feature from the WatchTime archives, contributor Thomas Gronenthal takes a look at its development. 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.
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