The CHRONOMASTER collection showcases the Manufacture's mastery of the automatic high-frequency chronograph movement and the unique design language it established in over 50 years. From faithful reproductions of its most emblematic references from the 1960s and 1970s to reaching new levels of precision with the 1/10 th of a second function in the evolved version of the famed calibre, the CHRONOMASTER collection bridges the past and present of the most prized automatic chronograph ever made.
The first-ever chronograph collection with a partially open dial revealing the beating heart of the movement returns in a new form. The CHRONOMASTER Open is crafted with revised proportions in a 39.5mm case and even more openness on the dial. The CHRONOMASTER Open offers a view into the high-frequency 5Hz regulating organ and escapement of the latest-generation El Primero automatic high-frequency calibre with a 1/10th of a second indicator.