n 1968, Longines launched the Ultra-Chron Diver, the first dive watch to be equipped with a high-frequency movement. At the time, Longines had already established itself as a pioneer in high-frequency technology. In fact, the winged hourglass brand created its first high-frequency timekeeping device to measure precisely 1/10’" of a second as early as in 1914. 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 Longines Ultra-Chron is inspired by the aesthetic codes as well as the professional dive features of the 1968 model. It features a unidirectional rotating bezel as well as a screwed- in caseback and crown. It also offers great legibility and is water resistant to 30 bar (300 meters). Its instantly recognizable 43mm cushion-shaped steel case is fitted with a diving bezel that boasts a sapphire insert with luminescent accents. The eye-catching black grained dial features a white minute track with alternating Super-LumiNova-coated batons and rhodium plated appliques.
The original Ultra-Chron logo is proudly applied on the dial and embossed on the caseback. The new Longines Ultra-Chron has a distinctive red minute hand which, like the hour hand, is coated with Super-LumiNova for optimal legibility.
At the heart of the new Longines Ultra-Chron is the calibre L836.6, a high-frequency ‘in house” movement. A watch is referred to as “high- frequency” when it is fitted with a movement whose balance-spring oscillates at 36,000 beats per hour (10 beats every second). These movements, which Longines pioneered in 1914 (to time 1/10’“of a second) and 1916 (to time 1/100’” of a second), improved precise timekeeping. From 1959 onwards, Longines made use of the high- beat-movements to increase the accuracy of its watches. Thanks to a reduction of the disruptive effects of shocks or of changes in the position of the movement, the high-beat movement proves to be more stable.
The accuracy of the Longines Ultra-Chron is confirmed by its certification as an ‘ultra chronometer” by TIMELAB, an independent testing laboratory in Geneva. This designation goes beyond the usual ‘chronometer” certification. The‘ultra-chronometer” qualification process tests the watch head and subjects the finished product to a 15-day testing period during which the watch is submitted to a series of tests at three ternperatures, 8°C, 23° C and 38°C, confirming that it meets the strict precision criteria (ISO 3159:2009 standard).
More than 100 years of experience in manufacturing high-frequency timepieces has made Longines the leading expert on professional timekeeping and in sports watches. The fast-beating movements are capable of measuring 1/10th or 1/100th of a second. In addition, they have proven to be extremely accurate.
The Longines Ultra-Chron is available with a choice of a leather strap or a steel bracelet and it is delivered in a special presentation box containing a black NATO strap crafted from recycled material.