Frederique Constant Highlife Automatic COSC 41mm Watch GradForHim The expansion of the HydroConquest

The expansion of the HydroConquest line emphasizes Longines' dedication to merging timeless design with horological advancements

Since launching Japans first divers watch in 1965

• Jewels: 6

The curved mineral glass enhances the watch's elegance

Frederique Constant Highlife Automatic COSC 41mm Watch GradForHim The expansion of the HydroConquestTesting Institute). This certificate is only issued to pieces that can guarantee perfect isochronism over a given time and at given positions in effect, their ability to tell the time correctly, consistently and precisely, within the strict limits enforced by an ISO standard. The COSC is an independent Swiss organisation that only issues its chronometer certificates to these pieces after the watches have undergone numerous tests over several days.