Zenith El Primero El Primero, 03.0520.4021/01.M520, 2007, 44 mm, White

The Zenith Grand Class Open El Primero 03.0520.4021/01.M520 is a sophisticated chronograph that showcases Zenith's renowned El Primero movement, known for its high-frequency precision at 36,000 vibrations per hour. One of its standout features is the open-heart dial, which provides a glimpse of the balance wheel in motion, while the transparent case back allows for a full view of the movement from behind. This 44mm stainless steel timepiece features a power reserve indicator at the 6 o’clock position, offering at-a-glance monitoring of its 50-hour reserve. The white dial with Arabic numerals enhances legibility, while the chronograph function ensures precision timing. This watch underwent a complete overhaul, ensuring optimal performance and longevity. It comes with a manufacturer’s warranty, making it an excellent choice for collectors and enthusiasts seeking a blend of craftsmanship, history, and technical excellence.