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Model review / Automatic winding

Zenith Triple Calendar: tenths of a second alongside the Moon

El Primero 3610 combines a 1/10-second chronograph, complete calendar and moon phase in a 38 mm steel case. We examine how to read the dense dial and the compromises behind this concentration of mechanics.

Published 22 October 2026Announced 29 January 20246 min read
Chronomaster Original Triple Calendar
© ZENITH · Image source

The essentials first

In one minute

Case38 mm
CalibreEl Primero 3610
Power reserveApprox. 60 h

Why it is interesting

One of the most engaging compact chronographs: high frequency becomes visible in the hand’s motion, while the calendar adds everyday usefulness. Choose it for an interest in mechanics rather than the catalogue’s function count.

Things to consider

The complete calendar needs correction after short months. Check the small windows for yourself before buying: a compact case does not make a complicated dial simpler.

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Zenith · Chronomaster Original Triple Calendar

The model in detail

Meet the watch

The long central stopwatch hand of the Chronomaster Original Triple Calendar circles the dial in ten seconds. Start the chronograph and the familiar, composed panda dial becomes a rather energetic instrument. Meanwhile, the weekday, month and Moon continue on their slower paths. That meeting of fast measurement and slow calendar time makes this model more interesting than a simple list of complications. We examine the silvery-white 03.3400.3610/38.C911 on a black leather strap, introduced as part of the collection on 29 January 2024.

The 38 mm case draws on the proportions of the 1969 El Primero A386. Without a broad external bezel, the modern Triple Calendar dedicates much of its visible surface to its displays despite its modest stated diameter. This is a particularly good reason to try it on rather than choose by diameter alone: small calendar windows and a dense scale each demand a comfortable reading distance. Someone who loves simple three-hand watches may find so much information tiring; a collector of complicated mechanics may find it absorbing.

Inside is the self-winding El Primero 3610, running at 5 Hz. A column wheel controls the chronograph’s operating modes, while its central hand permits readings to a tenth of a second. That is the stopwatch display’s resolution, not a promise of daily accuracy within a tenth. Everyday timing still includes the reaction time of the finger pressing the button. Yet the display makes the high frequency easy to understand: when the stopwatch runs, its effect is visible without a loupe.

Details and limitations

Learning the counter layout prevents confusion. Running seconds are on the left; the chronograph counts up to 60 seconds on the right and up to 60 minutes below. The Moon shares that lower counter. Black circles organise the light background, but the lower display has two jobs and inevitably needs a more deliberate glance. Warm-toned hands and markers soften the sporting graphics. To my eye, that small decorative concession helps the panda work with more than a casual jacket.

Official wrist photograph: the 38 mm panda version on its black leather strap.Enlarge

Official wrist photograph: the 38 mm panda version on its black leather strap.

© © ZENITH · Source

Triple means weekday, date and month: this is a complete calendar, neither an annual nor a perpetual one. The date needs manual correction after months shorter than 31 days. That is a reasonable choice if interacting with the mechanism is part of the pleasure; for someone who wants to forget settings altogether, the complicated dial becomes another obligation. There is a design compromise too: the date at 4:30 breaks symmetry, but it does not occupy the place of an hour marker in the upper half of the dial.

Setting deserves particular attention. The 3610 instructions specify correctors for the weekday and moon phase, operated with the supplied tool rather than a pen or a sharp object. Before correcting the Moon, the manufacturer requires the hands to be in the lower half of the dial, between 3 and 9 o’clock. It is worth reading that section of the manual carefully before the first start. A few minutes of preparation are preferable to working out recessed buttons on the move, especially if the watch regularly alternates with others.

The stated power reserve is approximately 60 hours. This matters more in a calendar watch than it might appear: stopping means restoring several indications. But “a whole weekend” is best checked against your own schedule. Friday at 18:00 to Monday at 09:00 is 63 hours, longer than the stated reserve even from a full wind. If the watch will be off the wrist for an extended period, extra winding beforehand helps use the available reserve, but cannot turn it into three days.

This version combines a steel case, sapphire crystals front and back, calfskin and a folding clasp. Water resistance is rated at 5 ATM; the manual separately recommends avoiding regular immersion of a leather strap and not operating pushers underwater. For a trip involving a swimming pool, that matters more than the sporting appearance. The display back offers another reason to choose mechanical complexity: it lets the owner examine the rotor and chronograph control system as well as the calendar windows.

I would consider the Triple Calendar for someone interested in reading a mechanism through its dial. There is visible stopwatch motion, the daily usefulness of a calendar and a small astronomical detail. Paying for complexity makes sense with that interest: there are still much simpler ways to find out the month. The essential check before buying is how easily you personally distinguish the hands and small windows. If they work for your eyes, compactness becomes part of this Zenith’s character rather than a limitation.

Sources

Zenith: official product page for 03.3400.3610/38.C911www.zenith-watches.comZenith: Chronomaster Original Triple Calendar presentationpressroom.zenith-watches.com · 29 January 2024Zenith: Triple Calendar collection technical sheetpressroom.zenith-watches.comZenith: user instructions, El Primero 3610 sectionzenith-sfcc.cdn.prismic.ioZenith: the high-frequency El Primero movement familywww.zenith-watches.com