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Introducing – The Zenith Chronomaster Open, Now In Blue Boutique Edition


The open-heart style has long been associated with the classic El Primero chronograph, with the fast-beating heart of the watch, its 5Hz escapement, fully exposed through a hole on the dial. Something quite emblematic of the 2000s editions of this watch collection, it somehow lost a bit of its appeal… Until earlier this year, when Zenith brought back the concept with a far more modern take. And now, the Zenith Chronomaster Open is presented with a new dial colour, which is associated with the brand’s boutique editions

If the concept of the El Primero Open dates back to the 2000s, it has been revamped very recently with the new Chronomaster Open. This new range of watches, which we discovered here in March as part of the Watches & Wonders novelties, is using most of the acclaimed Chronomaster Sport’s specifications, yet in a streamlined case, but with a more complex dial architecture. Indeed, the Zenith Chronomaster Open is essentially a Chronomaster Sport without the ceramic bezel and with a hole in its dial. And for this reason, it has far more appeal than the previous editions…

The Chronomaster Open Boutique Edition, just like the standard models in this collection, is presented in a classic 39.5mm stainless steel case, which feels identical to the Chronomaster Sport in a shape and finish, yet has a slightly reduced diameter (minus 1.5mm), mostly due to the absence of the external ceramic bezel. Crown and pushers are identical too, and the overall shape is that of a classic, modern watch with just a tad of vintage appeal. It’s also a fairly resistant watch, with a 100m water-resistance and a duo of sapphire crystals on both sides of the watch. It’s also a rather compact watch on the wrist, with an appreciable 45mm lug-to-lug measurement.

New for this Zenith Chronomaster Open Boutique Edition is the dial, which adopts a deep blue colour – in the same vein as the Chronomaster Original Boutique Edition. Sunray-brushed, with applied faceted markers and hands, it retains the classic grey and silver snailed sub-counters, emblematic of El Primero watches. Being an Open Zenith, there’s of course a hole in the dial, which now takes quite some space between 9 and 12 o’clock, as it reveals the balance wheel, the escapement and the mechanism behind the small seconds, which sits under a transparent polymer plate.

Under the hood is the in-house El Primero Calibre 3604, once again essentially the same movement as the Chronomaster Sport, only revised to have exposed parts. And there’s nothing wrong with that, on the contrary, as this movement is a strong update over an emblematic engine. Using the traditional 5Hz frequency of this collection, it adds a longer power reserve of 60 hours and a silicon escape wheel and anchor for antimagnetic, lubrication-free properties. The decoration has also been drastically modernized and the display now includes a 1/10th of a second central chronograph hand, rotating around the dial in 10 seconds. The rest of the display consists of a small seconds counter at 9 o’clock, a 60-minute counter at 6 o’clock and a 60-second totalizer at 3 o’clock.

The Zenith Chronomaster Open Boutique Edition and its exclusive blue dial come with a brushed and polished steel bracelet. Presented next to the silver and black editions, it isn’t limited in production but is only available through the brand’s official boutiques, and online at the brand’s e-commerce website. It is now available and priced at EUR 9,700 (the same price as the classic editions). For more details, please visit

Technical specifications – Zenith Chronomaster Open Boutique Edition

Case: 39.5mm diameter x 13mm height – 45.2mm lug-to-lug – stainless steel case, brushed and polished – smooth polished bezel – sapphire crystals with AR coating front and caseback – 100m water-resistant

Dial: Sunray-brushed blue dial – snailed subdial in two different colours – rhodium-plated faceted markers and hands, coated with Super-LumiNova – translucent polymer subdial at 9 o’clock

Movement: Calibre El Primero 3604, in-house – automatic winding – 36,000vph – 35 jewels – 60h power reserve – silicon escape wheel and lever – open base plate and bridges – central hours and minutes, small seconds at 9 o’clock, 1/10th of a second central chronograph hand, 60min counter at 6 o’clock, 60sec counter at 3 o’clock – star-shaped winding rotor

Bracelet: 3-link brushed and polished stainless steel bracelet with folding clasp

Reference: 03.3300.3604/51.M3300

Availability: Only from the brand’s boutique and website

Not limited

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