The Zenith Chronomaster open 18.3300.3604/69.C922 offers a rare and captivating view into one of the most celebrated chronograph movements ever created—the El Primero. Bridging past and present, this striking timepiece reveals the beating heart of high-frequency Swiss watchmaking through a distinctive open dial, combining technical mastery with refined elegance.

Housed in a luxurious 39.5mm 18K rose gold case, this model is a bold yet timeless expression of Zenith’s 50-year chronograph legacy.

Part of the iconic Chronomaster collection, the Chronomaster Open exposes the El Primero movement in an unexpected and captivating way. An open base plate and bridges allow a direct view of the escapement, including an escape wheel and pallet lever crafted from lubricant-free silicone—a testament to Zenith’s commitment to innovation and precision.

This design doesn’t merely showcase mechanics; it celebrates them.

Driven by the El Primero 3604 automatic movement, this chronograph measures elapsed time with extraordinary accuracy—displaying time to 1/10th of a second.

The elegant matte silver dial features Zenith’s signature tri-colour counters, including:

• 60-minute counter at 6 o’clock
• 60-second counter at 3 o’clock
• Transparent running seconds counter, revealing the movement in motion
• A central chronograph hand completes one full revolution every 10 seconds, underscoring the high-frequency nature of the El Primero.
• With a 60-hour power reserve, this timepiece delivers performance as impressive as its aesthetics.

The warm tones of the 18K rose gold case are perfectly complemented by a blue calfskin leather strap with a secure folding clasp. The result is a sophisticated yet contemporary chronograph equally suited for daily wear or refined occasions.

Key Features & Highlights

• Iconic El Primero 3604 automatic chronograph
• Open dial showcasing the escapement
• 1/10th of a second chronograph precision
• 39.5mm 18K rose gold case
• Matte silver dial with tri-colour counters
• 60-hour power reserve
• Lubricant-free silicon escapement components
• Sapphire crystal
• Water resistant to 10 ATM (100 meters)

Why This Chronomaster Belongs in Your Collection

The Zenith Chronomaster Open is more than a chronograph—it is a living exhibition of mechanical excellence. Combining legendary movement architecture, cutting-edge materials, and precious metal craftsmanship, this watch stands as one of the most compelling modern expressions of the El Primero.

For collectors seeking heritage, innovation, and visual drama in equal measure, this is a standout choice.