The Zenith El Primero Chronomaster XXT Open Grande Date is a sophisticated showcase of Zenith’s watchmaking prowess, blending technical mastery with an elegant presence. The imposing 45mm stainless steel case makes a statement on the wrist, while the black guilloché dial offers a rich, textured backdrop for its complex functions.

The most captivating feature is the iconic open heart display at 10 o’clock, revealing the beating escapement of the legendary El Primero 4039 automatic movement—famed for its high frequency of 36,000 vibrations per hour. The Grande Date aperture at 2 o’clock is seamlessly integrated, balancing the dial’s dynamic layout. A 30-minute chronograph counter at 3 o’clock and a power reserve indicator at 6 o’clock complete the ensemble, showcasing both precision and elegance.

Finished on a supple black alligator leather strap, it’s the perfect fusion of heritage and innovation—bringing together Zenith’s high-frequency chronograph legacy with a modern, open-heart design. A true masterpiece for those who appreciate both technical brilliance and refined aesthetics.

Model – El Primero
Reference – 0312604039
Year – 2013
Size – 45mm
Dial – Black
Case Material – Steel
Bracelet Material – Leather
Movement – Automatic
Power Reserve – 50hrs
Water resistance –
Condition – 8.5/10
Accs – Full Set
Remarks –