Zenith El Primero Chronomaster Open Chronograph – Ref. 03.1260.4021/21.C505
The Zenith El Primero Chronomaster Open Ref. 03.1260.4021/21.C505, offered by Geneva Watch Company, showcases the brand’s celebrated high-frequency chronograph heritage through its distinctive open-dial design. Featuring a bold 45mm stainless steel case and a striking black dial, this timepiece combines sporty proportions with traditional Swiss craftsmanship. Powered by the Zenith El Primero 4021 automatic calibre, it offers a captivating view of the movement’s mechanical architecture alongside practical chronograph and power-reserve functions.
The watch features a 45mm stainless steel case measuring 14mm thick, protected by a scratch-resistant sapphire crystal and complemented by a transparent exhibition caseback. Its black dial features silver-tone hands and applied Roman numeral and index hour markers, with luminous detailing for enhanced legibility. The open aperture at 10 o’clock reveals the beating heart of the El Primero movement, while the display also includes a 30-minute chronograph counter at 3 o’clock, a power-reserve indicator at 6 o’clock, and small seconds at 9 o’clock. The El Primero 4021 automatic movement, equipped with 39 jewels, operates at 36,000 vibrations per hour and delivers an approximately 50-hour power reserve. A black leather strap completes its sporty, refined appearance.
