Zenith Chronomaster Open El Primero Chrono 03.0240.4021 45mm (2010)

The Zenith Chronomaster Open El Primero 03.0240.4021 is a striking blend of high horology and classic design. Housed in a bold 45mm stainless steel case, this chronograph showcases a crisp white dial with elegant detailing, including blued steel hands, applied hour markers, and a power reserve indicator. The signature open-heart window at 10 o’clock reveals the escapement of the legendary El Primero movement—one of the first automatic chronograph calibres ever made, beating at an impressive 36,000 vibrations per hour.

The chronograph sub-dials are arranged for balanced symmetry, while the sapphire crystal caseback allows a full view of the beautifully decorated movement. Paired with a black leather strap and stainless steel deployant clasp, the Chronomaster Open offers a sophisticated fusion of technical innovation and timeless aesthetics.

Specifications:

• Model: Chronomaster Open El Primero Chrono, 03.0240.4021
• Dial: White dial with an open-heart cutout, revealing the intricate El Primero movement
• Crystal: Scratch-resistant sapphire crystal with anti-reflective coating
• Case Back: Exhibition case back, allowing a view of the beautifully finished movement
• Case: 38mm stainless steel, offering a bold yet refined presence
• Chronograph: Automatic El Primero 4021 movement, known for its high-frequency 36,000 vibrations per hour, ensuring superior accuracy
• Complications: Grande Date display at 2 o’clock, small seconds, and a power reserve indicator
• Strap: Black leather strap with a stainless steel buckle for a classic look
• Movement: Automatic
• Water Resistance: 30 meters (3 ATM), suitable for daily wear