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. CASE Shape: Round Material: Stainless steel Glass: Scratch-resistant sapphire crystal, with several layers of anti-reflective coating on both sides Case Back: Screw-down case back Dimension: Ø 39.00 mm Lug distance: 20 mm Thickness: 11.50 mm Water Resistance: Water-resistant to 10 bar Weight: 92.0g DIAL & HANDS Dial color: Black matt Hour markers: Applied Arabic numerals Hands: Gilt hands Specificities: Swiss Super-LumiNova® MOVEMENT & FUNCTIONS Movement Type: Automatic Functions: Hours, minutes, seconds Caliber: L888.4 Movement Description: Self-winding mechanical movement beating at 25'200 vibrations per hour, with a monocrystalline silicon balance-spring power reserve up to 72 hours STRAP Bracelet/Strap: Strap Material: Rubber Color: Green Buckle: With buckle REF: L38094539