Since 1969, the name “El Primero” has almost inevitably evoked the chronograph: pushers, counters, high frequency, and that ability to measure time that has secured ZENITH’s famous caliber a place in the history of modern watchmaking.
Fifty-seven years later, at the 2026 Geneva Watch Days, ZENITH chooses to tell this story through three hands.
The new CHRONOMASTER Solo Sport is the first three-hand model in the collection and features one of the most fascinating elements of the El Primero: 5 Hz, equivalent to 36,000 vibrations per hour. Hours, minutes, central seconds, and, on three of the four models, a date window at 3 o’clock.
The name “Solo” says a lot on its own. The chronograph disappears from the dial, but the frequency remains. And for a collection that bears the word “CHRONOMASTER” on the dial, this is a new development that deserves our full attention.
El Primero, three hands, and 36,000 vibrations per hour
Inside the Solo Sport lies the El Primero 3620 caliber, an in-house automatic movement derived from the 3600 chronograph. A silicon escapement, seconds stop, bidirectional winding, and a 60-hour power reserve round out a movement that retains the beat rate historically associated with the El Primero family.
Here, that frequency takes center stage: the large central seconds dial. Ten half-oscillations per second translate into an incredibly fine progression along the minute track, perhaps the simplest and most fascinating way to experience what it means to have a 5 Hz movement beneath the dial. No need to start a counter: the rhythm of the 3620 is there every time we check the time.
A mechanical choice that makes the Solo Sport more interesting than a simplified CHRONOMASTER. The chronograph was the El Primero’s defining feature; its high frequency has always been its heart and soul. ZENITH has decided to start with the latter.
A 40 mm Chronomaster, ready for anything
The stainless steel case measures 40 mm, features a screw-down crown protected by lugs, and is water-resistant to 20 ATM (200 meters). A unidirectional rotating ceramic bezel surrounds the dial, a new feature that plays a decisive role in shaping the CHRONOMASTER’s new look.
The bezel allows you to quickly measure a time interval and makes the Solo Sport more versatile than its three hands might initially suggest. Together with the screw-down crown and 200 meter water resistance, it brings real technical substance to that “Sport” moniker, a term that’s often all too easily stamped onto a watch face.
Then there’s the 40 mm. It’s a size we enjoy seeing, and we’re even more curious to try it out. The Solo Sport combines a sturdy build, a pronounced bezel, and crown guards without resorting to oversized diameters. From the first images, the proportions seem just right; only our wrists will tell us just how much.
ZENITH has designed the high-frequency
While the 3620 sets the pace for the Solo Sport, the dial seeks to make that rhythm visible. The ceramic is engraved with a series of “Z”s angled at 45°, a motif developed exclusively for this collection and conceived by ZENITH as a graphic representation of the cadence and vibrations of high frequency.
In close-up shots, it’s a detail you can’t help but admire. The pattern doesn’t dominate the surface: it appears, disappears, and shifts in intensity with the light. On the white ceramic dial with a sunburst finish, it follows the radial reflections; on the glossy black and brown dials, it takes on a deeper, more subtle presence.
Around the perimeter, we find the “shark tooth” hour markers, inspired by certain historic ZENITH models, with their closely spaced design that complements the movement of the central hour hand particularly well. The letter “Z” also appears on the seconds balance wheel; the applied hour markers and faceted hands are coated with Super-LumiNova SLN C1.
Part of the beauty lies in the space itself. Without the chronograph counters, we can finally follow the ceramic’s design from one end of the dial to the other, linger on the minute track, and let the seconds hand bring movement to the dial.
Four models. The no-date model has already caught our attention
The launch includes four configurations: white ceramic with a “soleil” finish and a black bezel for the first; glossy black on black for the second; and a brown ceramic dial and bezel for the third. All feature a date window at 3 o’clock and are priced at 10,500 euros.
Brown is probably the color that will stand out most in photographs. A glossy ceramic finish in this shade can look quite different depending on the lighting, and we’re curious to see how much it manages to distance itself from the sportier feel of the white and black versions.
Then there’s the 03.5000.3620/21.M5000. Glossy black, black bezel, and no date window. We’ll admit it: this is the one we spent the most time looking at. The window at 3 o’clock disappears, the Z-pattern runs seamlessly across the dial, and the symmetry becomes almost absolute. Even the name “Solo” seems to fit this configuration particularly well.
Finally, there is one detail that is anything but minor: it costs 9,500 euros, exactly 1,000 euros less than the three versions with a date.
ZENCLASP: Those Millimeters That Make All the Difference
The three-link steel bracelet introduces the ZENCLASP, a folding clasp unveiled by ZENITH at Watches and Wonders 2026—across the entire Solo Sport collection.
It’s worth taking a closer look. It consists of 41 components, including ten ceramic balls used to lock and position the mechanism. It took three years and approximately 1,800 hours of development, followed by testing equivalent to over 600,000 opening and closing cycles.
These are impressive numbers, but when it comes to wearing it on the wrist, what matters most to us are those crucial 10 millimeters that is, the range available for fine-tuning the bracelet, divided into 2.5 mm increments and adjustable without the use of tools.
Just Sports
The sapphire caseback reveals the 3620 caliber and the new star-shaped openworked oscillating weight, a signature ZENITH feature that is immediately recognizable as soon as you turn the watch over.
After examining it from both sides, the Solo Sport seems perhaps even more interesting than its design initially suggested. We don’t feel like something is missing. Rather, we see something that wasn’t there before in CHRONOMASTER. A 40 mm three-hand watch with 200-meter water resistance, ceramic, micro-adjustment, and a high-frequency in-house movement. A watch we can easily imagine wearing every day, one that—despite its much more minimalist design, houses a mechanism that is anything but ordinary.
We’re eager to try it out, to see how those 40 mm actually look on the wrist, to check out the brown ceramic in natural light, and to play around with the new ZENCLASP. But above all, there’s one very simple thing we can’t wait to do: watch the seconds tick by. It might seem like the most ordinary thing in the world when looking at a three-hand watch, but with an El Primero running at 36,000 vibrations per hour, it’s a little less so!
The new ZENITH CHRONOMASTER Solo Sport will be available starting September 2, 2026, at ZENITH boutiques, on the brand’s online store, and through authorized retailers. The three models with date displays will be priced at 10,500 euros, while the black version without a date display will be priced at 9,500 euros.
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