Zenith · Family: El Primero
The Zenith Chronomaster Sport ref. 03.3300.3600/69.M3300 is a 41mm steel automatic chronograph built around the El Primero 3600 caliber, a direct descendant of the 1969 movement that opened the era of high-frequency automatic chronographs. Its standout trait: it measures 1/10th of a second via a central hand that completes a full rotation every 10 seconds, driven by 36,000 vibrations per hour. Cazador does not yet publish a price for this reference: our database has fewer than 5 verified observations.
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The Zenith Chronomaster Sport launched in 2021 [UNVERIFIED] as a contemporary reinterpretation of the 1969 Chronomaster A386, the watch that debuted the El Primero caliber: one of the world's first high-frequency automatic chronograph movements, unveiled almost simultaneously with the Chronomatic caliber from Heuer-Breitling-Hamilton-Dubois Depraz and with the Seiko 6139. While those two rival projects beat at 19,800 and 21,600 vph respectively, the El Primero ran at 36,000 vph (5 Hz), the frequency needed to accurately measure a tenth of a second — a feat neither competitor could match out of the box.
More than five decades later, the El Primero 3600 caliber inside this reference keeps that same signature: column wheel, high frequency, and a central chronograph hand that completes a full rotation of the dial in just ten seconds instead of sixty, marking the tenth of a second on a dedicated subdial scale. It is as visual as it is functional — the watch literally "runs" once the chronograph is engaged.
The 41mm steel case recovers proportions closer to the original A386 than the larger El Primero generations that followed, and the bi-color ceramic bezel over a black dial with blue and grey counters revisits the same contrasting-counter logic that made the A386 iconic, in an updated palette. Through the sapphire caseback, the star-shaped rotor is visible — another direct nod to El Primero tradition.
Zenith positions the Chronomaster Sport as a direct alternative to the Rolex Daytona within the high-end steel sport chronograph segment, leaning on an argument no rival replicates out of the factory: 1/10th-of-a-second precision from the movement itself, not a bolt-on module. It is, in essence, the modern vindication of a caliber that reached production in 1969 among the first of its kind, and that Zenith has never stopped manufacturing since.
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The central chronograph hand doesn't complete its rotation in 60 seconds like a conventional chronograph — it does so in just 10, thanks to the El Primero 3600's 36,000 vph. Each division on the scale marks a tenth of a second.
They're often compared on price and segment, but the technical pitch differs: the Daytona offers proven robustness, while the El Primero 3600 delivers high frequency (5 Hz) and factory 1/10s precision that no current Rolex chronograph matches.
Around 60 hours [UNVERIFIED against current official catalog], thanks to a twin-barrel system that offsets the extra energy draw of running at 36,000 vph — almost double a conventional automatic movement.
Because it was one of the world's first automatic chronograph movements, launched almost simultaneously with the Chronomatic caliber (Heuer-Breitling-Hamilton) and the Seiko 6139 — but the only one able to measure 1/10th of a second thanks to its 36,000 vph high frequency.
100 meters [UNVERIFIED against current official catalog], enough for swimming and daily wear, though it isn't built as a professional dive watch; its purpose is a high-precision sport chronograph for everyday use.
Based on the catalog data we work from, the Chronomaster Sport line remains in current production [UNVERIFIED for this specific variant]; we'll update this page as soon as Zenith confirms any status change.