In 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 set new records in terms of accuracy. The new Ultra Chron is inspired by the aesthetic codes and professional diving features of the 1968 model. These chronometer certified watches are powered by an exclusive Longines calibre equipped with a silicon balance spring and resistant to magnetic fields.