BASELWORLD 2017: Zenith unveils the astonishing Defy El Primero 21

Baselworld 2017: Zenith CEO Jean-Claude Biver reveals the Defy El Primero 21,
an astonishing chronograph with a 100TH of second movement. A milestone.
The world’s most accurate series-made chronograph in 1969 enters the 21th century.