Zenith Grande Chronomaster Open 45mm 03.1260.4021/73M.1260 Open Heart Power Reserve El Primero 2005

Brand: Zenith

Model: Grande Chronomaster Open  

Reference Number: 03.1260.4021/73M.1260

Materials: Steel

Case diameter: 45mm 

Movement: Automatic

Condition: Excellent

Year of Production: 2005

Box: Yes

Papers/Warranty Card: Yes

Booklets: Yes

ID : 62660 

The Zenith Chronomaster Open 03.1260.4021/73.M1260 is a bold and distinctive timepiece that showcases the brand’s mastery of mechanical watchmaking. Housed in a 45 mm stainless steel case, it features Zenith’s signature open-heart design, revealing the intricate balance wheel and escapement through a cutout in the dial. This partial skeletonization allows the wearer to admire the movement in action while preserving the legibility and symmetry of a classic chronograph. The case’s polished and brushed surfaces enhance its refined yet sporty presence, and the stainless steel bracelet adds both durability and an integrated, seamless look on the wrist.

Inside, the watch is powered by Zenith’s legendary El Primero automatic chronograph movement, celebrated for its high frequency of 36,000 vibrations per hour, ensuring remarkable accuracy and a smooth-running chronograph seconds hand. The model combines the charm of traditional Swiss craftsmanship with modern flair, offering a water resistance of 30 meters—making it more suited for daily wear and special occasions than for aquatic adventures. With its fusion of technical prowess and open-worked elegance, the Chronomaster Open is a conversation piece for those who appreciate both engineering and artistry.