Zenith Chronomaster Open
03.3300.3604/21.M3300
2-year warranty, extendable to 5 years. Register here
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The Zenith Chronomaster Open showcases the heartbeat of the legendary El Primero movement through a partially open dial. Encased in a 39.5mm stainless steel case, this timepiece features a matte black dial with Zenith’s signature tri-colour chronograph counters and a transparent running seconds counter at nine o’clock, revealing the escapement in motion. The red central chronograph hand and precise 1/10th of a second scale emphasize the watch’s high-frequency performance. Inside, the El Primero 3604 automatic movement powers the chronograph with remarkable precision, offering a 60-hour power reserve. Completing the design is an integrated stainless steel bracelet, adding a refined yet sporty touch. With its masterful balance of openwork mechanics and timeless aesthetics, the Chronomaster Open stands as a testament to Zenith’s watchmaking excellence.
Full Specification
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Brand ZenithCollectionChronomasterSeriesOpenModel No03.3300.3604/21.M3300
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MovementFeatures Chronograph, Open Balance Wheel, Small Seconds, 1/10th SecondsMovement AutomaticCalibre El Primero 3604CaseCase Size 39.5 mmCase Thickness 13.60 mmCase Shape RoundCase Material SteelCase Back See-through Case BackGlass Material Sapphire CrystalDialLuminosity On Hands, Hour MarkersDial Colour BlackHands BatonIndexes BatonStrapStrap Material SteelStrap Colour SilverClasp Type Folding ClaspBuckle/Clasp Material SteelOtherEAN 7613061031543Gender UnisexWater Resistance (M) 100Warranty Period 2-year warranty, extendable to 5 years. Register hereCountry of Origin Switzerland
Collection Video Discover the Chronomaster Collection
About the Zenith Chronomaster Collection
Zenith introduced the Chronomaster collection in 1994, designed after the timepiece that first housed the legendary El Primero calibre, the world’s first automatic high-frequency chronograph calibre, in 1969. Since then, the collection has become a mainstay of the brand's portfolio and the best platform to demonstrate the exceptional performance of the El Primero calibres.
Bold Aesthetics
The Zenith Chronomaster is a celebrated collection of high-precision chronograph watches with a striking design, characterised by a variety of case types and sizes. From the vintage-inspired 37mm tonneau case to the more contemporary 41mm cases seen in models like the Chronomaster Sport, Zenith has consistently adapted Chronomaster's design to suit modern tastes. These watches are most famously equipped with tricoloured chronograph sub-dials adorned in blue, grey, silver, and more hues. These dials add a vibrant, recognisable element to the collection.
Iterations
The Zenith Chronomaster collection masterfully integrates historical elegance with cutting-edge technology. The Chronomaster Original pays homage to the 1969 A386, featuring the El Primero 3600 movement, which offers a 60-hour power reserve and enhanced accuracy with its stop-seconds mechanism. This model captures the essence of its predecessor with distinctive design elements. The Chronomaster Revival series revisits classic designs while incorporating modern advancements. The Chronomaster El Primero Open stands out with its transparent aperture that reveals the balance wheel, which includes a silicon escapement for greater reliability and a 50-hour power reserve. The Chronomaster El Primero Tourbillon combines an elegant tourbillon complication with the El Primero movement, showcasing high horological craftsmanship and precision. The Chronomaster collection is a nod to Zenith's storied past and innovative future. With classic design and modern technology, these timepieces offer collectors and enthusiasts a perfect timeless style and advanced performance.

ABOUT THE MOVEMENT
The Zenith El Primero 3604 is a high-frequency automatic chronograph movement, operating at 36,000 vibrations per hour (5Hz). A modified version of the El Primero 3600, it features a column-wheel mechanism for smoother chronograph operation and is capable of measuring 1/10th of a second with a central chronograph hand that completes a full rotation every 10 seconds. The movement has a 60-hour power reserve and includes hours, minutes, small seconds, and stop-seconds functionality. Additionally, the El Primero 3604 is known for its open base plate and bridges, allowing a clear view of the silicon escapement. It powers models such as the Chronomaster Open series.

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- Brand Zenith
- Reference El Primero 3604
- Movement Automatic
- Display Analog
- Power Reserve Approx. 60 hours
- Jewels 35
- Frequency 36000 bph
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