This Zenith ChronoMaster Chronometer represents a significant chapter in modern chronograph history, when the El Primero evolved beyond pure chronograph performance to incorporate complex calendar functions. This example is powered by the Zenith calibre 410 (31 jewels), a sophisticated development integrating a complete calendar—day, date and month—together with a moon phase display, all driven by the high-frequency El Primero architecture.

The silver dial offers excellent legibility and a well-balanced layout, combining chronograph indications and calendar information without visual overload. Roman numerals, peripheral scales and a tachymeter graduation reflect the design language of the ChronoMaster line, conceived as a functional yet elegant chronograph rather than a purely technical showcase. The 40 mm stainless steel case retains classical proportions consistent with the model’s identity.