Ultra-chron Classic Collection_Defy Buckle Material: DLC-coated titanium

Buckle Material: DLC-coated titanium

Weight: 149

U13313121B1A1

Encased in robust steel with an ergonomic black ceramic bezel

Focused on precision timing

Ultra-chron Classic Collection_Defy Buckle Material: DLC-coated titaniumIn 1968, Longines launched the Ultra Chron Diver, the first dive watch equipped with a high frequency movement. At the time, Longines had already established itself as a pioneer in high frequency technology. As early as 1910, the winged hourglass brand created the first high frequency timekeeping device capable of measuring 1 10th of a second. In 1959, Longines developed the first high beat movement for a wristwatch, an observatory chronometer that