A perfect fusion of style, functionality, and technical excellence, the ZENITH CHRONOMASTER Original triple calendar chronograph made its grand return in early 2024 in a compact and historically inspired CHRONOMASTER model. First introduced in a steel case, this iconic design now returns in a precious metal version, harmoniously blending the elegance of black with the warmth of rose gold. The ZENITH triple calendar chronograph is one of the most emblematic variations of El Primero. Not widely known, the legendary high-frequency automatic chronograph was developed to accommodate the triple calendar and moon phase functions right from the very beginning. ZENITH even made a series of 25 prototypes as early as 1970 using the round case design of the A386.