ZENITH Chronomaster Sport Skeleton El Primero 3600 SK Automatic Chronograph 41mm Watch New Old Stock using Citizens Eco-Drive sustainable technology

using Citizens Eco-Drive sustainable technology

each gem exudes brilliance and beauty

Anti-tarnish treatment

perfect for making a statement

are all blackened and filled with black Super-LumiNova (green emission)

ZENITH Chronomaster Sport Skeleton El Primero 3600 SK Automatic Chronograph 41mm Watch New Old Stock using Citizens Eco-Drive sustainable technologyWhen ZENITH introduced the El Primero in 1969, it did more than launch the worlds 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 Maisons identity. At Watches and Wonders 2026, ZENITH unveils a new expression of this legacy: the