Zenith
Chronomaster Sport
03.3100.3600/69.M3100
The El Primero legacy reborn in a modern 41 mm sport package.
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Overview
The Zenith Chronomaster Sport ref. 03.3100.3600/69.M3100 is a contemporary expression of the manufacture's most celebrated movement, the El Primero, housed in a 41 mm stainless steel case suited to everyday wear. Its white dial is immediately distinguished by tri-color sub-registers — a visual signature that traces directly back to the original 1969 El Primero design. The reference sits at the heart of the modern Chronomaster line, balancing sport-oriented robustness with the horological prestige of a high-frequency integrated column-wheel chronograph.
History
Zenith introduced the Chronomaster Sport in 2021 as a deliberate repositioning of the El Primero for a generation of collectors drawn to sportier, more versatile references. The model succeeded earlier Chronomaster iterations by adopting a broader 41 mm case, a more legible open-worked dial architecture, and an updated execution of the El Primero calibre. Cal. El Primero 3600 — beating at 36,000 vph and offering one-tenth-of-a-second chronograph measurement — continues the lineage of the movement first introduced in 1969, widely regarded as one of the first series-produced automatic chronograph calibres. Since its launch, the Chronomaster Sport has become a cornerstone reference within Zenith's current catalogue.
Notable points
- Cal. El Primero 3600 operates at 36,000 vph (5 Hz), enabling one-tenth-of-a-second chronograph precision — a defining technical trait of the El Primero family.
- The tri-color sub-register layout on the white dial — with each counter rendered in a distinct hue — is a direct homage to the iconic aesthetic of the original 1969 El Primero.
- At 41 mm, the stainless steel case represents a modern sizing that broadened the Chronomaster's appeal compared to earlier, smaller references in the line.
- The El Primero movement is manufactured entirely in-house at Zenith's Le Locle facility, underscoring the reference's status as a true manufacture chronograph.
- The Chronomaster Sport's integrated bracelet and overall case architecture give it a cohesive, sport-watch character that distinguishes it from the dressier Chronomaster Original sibling.