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El Primero 40th anniversary

Zenith 2009

Zenith: Defy Anniversary Red Gold © Zenith/2009

Launched in 1969, El Primero is the first chronograph movement capable of measuring short periods of time with 1/10th of a second accuracy, a performance made possible by using a balance that oscillates at 36'000 vibrations per hour. This absolute accuracy means that the movement passes the tests of the COSC (Swiss Official Chronometer Testing Institute). As a double push-button chronograph with over 50 hours of autonomy, this movement – which also has an instantaneous jump calendar – can accept other complication add-ons: Triple Calendar, Moon Phase, Flyback...

It is the basis for the various current models of the 4000 series, with their new integral complications, the famous OPEN (4021) being a good example.

In 2009, Zenith celebrates the 40th anniversary. This occasion is marked by the launch of two special series celebrating the first timepiece to be fitted with the legendary El Primero calibre: The Originals and New Vintage 69.