The chronograph that has become a Swiss watchmaking legend, celebrates its 43rd Anniversary.

With its El Primero 3019 movement, Zenith was the first to produce a high-frequency automatic integrated column-wheel chronograph.
The El Primero chronograph sets itself apart by a unique technical feat: it is the only series-produced caliber capable of actually measuring the tenths of a second thanks to a direct connection with its regulating organ. The secret of this extreme precision is the speed of its balance: 10 vibrations per second, compared to the usual rate of others beating at 8 vibration per second.

Ever since it was first launched in 1969, this chronograph has always been considered the best on the market.