ZENITH Chronomaster Sport Skeleton El Primero 3600 SK Automatic Chronograph 41mm Watch

When ZENITH introduced the El Primero in 1969, it did more than launch the world’s first automatic, integrated high-frequency chronograph. It established a new standard of precision in mechanical watchmaking. Beating at 5Hz, 36 000 vibrations per hour, and capable of measuring 1/10th of a second, the El Primero became the technical foundation of the Maison’s identity.

At Watches and Wonders 2026, ZENITH unveils a new expression of this legacy: the CHRONOMASTER Sport Skeleton. Through its openworked architecture, the Manufacture reveals the mechanical complexity of its most emblematic calibre while introducing a new patented folding clasp, a new ergonomic development reflecting ZENITH’s holistic vision of performance, where movement engineering and functional innovation evolve together.