LONGINES – HERITAGE Ultra-Chron Carbon 43mm Chronometer 2025
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The Ultra-Chron collection adopts carbon: an innovative material that is both strong and light, and now being used for the first time in a Longines watch case. Powered by a Longines’ exclusive high-frequency movement, beating at 36 000 vibrations per hour, this model draws inspiration from an iconic 1968 watch with a distinctive cushion-shaped case. Combining innovation and precision, each Ultra-Chron Carbon offers a unique design and is fully chronometer-certified by TIMELAB.
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Launched in 1968, the Ultra-Chron Diver made history as the first diver’s watch to feature a high-frequency movement. At the time, Longines had already established itself as an expert in this technology, having patented it in 1910 for use in sports timekeeping.
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In 2022, the brand unveiled a new generation Ultra-Chron, which paid tribute to the 1968 model while incorporating the latest technological innovations.
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Today, Longines continues to innovate by introducing a new Ultra-Chron model with a carbon case, a first for the brand. This material, known for being both ultra-resistant and lightweight, is widely used in cutting-edge industries such as aeronautics, a field with which Longines has been closely associated for over a century. The 43 mm-diameter case is crafted from strips of unidirectional carbon fibre and epoxy resin, which are then placed into a mould and heated to a high temperature, compressed under high pressure, and finally cold-cut. It then takes on the iconic cushion shape of the Ultra-Chron case.
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This unique manufacturing process creates random patterns in the layout of the fibres, making each case visually unique and giving it a strong identity. Thanks to carbon’s lightweight properties, this new model weighs less than 80 grams, including both the watch and strap. It is water-resistant up to 30 bars (300 metres).
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The titanium bezel is fixed and features an aluminium insert engraved with a scale numbered in increments of 10. The case back and screw-down crown are also in titanium. Beneath a sapphire crystal with multi-layer anti-reflective treatment, the sand-blasted anthracite dial features a chapter ring marked by twelve applied silver indexes. These, along with the grey PVD hour and minute hands, are coated with a Super-LumiNova® blue luminescence treatment.
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Like the other models in the collection, the Ultra-Chron Carbon is powered by the exclusive Longines high-frequency calibre L.836.6. This movement oscillates at 5 Hertz, or 36 000 vibrations per hour. Compared with conventional mechanical movements, it offers greater stability in response to shocks and changes in position caused by wearing the watch. Equipped with a silicon balance-spring and innovative components, this calibre is also up to ten times more resistant to magnetic fields than the ISO 764 standard.
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This watch is also fully certified as a chronometer by TIMELAB, an accredited independent watch testing laboratory in Geneva.
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In keeping with the ISO 3159 standard, the qualification process subjects the finished product to a 15-day testing period during which the entire watch is put through a series of functional tests in various positions, repeated at three different temperatures, 8°C, 23°C and 38°C, to confirm its accuracy.
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The Ultra-Chron Carbon is fitted with a black technical fabric strap featuring a titanium buckle. Embracing dark tones, the watch is presented in a bespoke black box.
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Technical specifications
Collection: HERITAGE
Model name: HERITAGE Ultra-Chron Carbon
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Reference: L2.839.4.52.2
Case
Material: Cushion shape, carbon case middle with titanium structure
Diameter: 43 mm
Thickness: 14 mm
Sapphire crystal with multi-layer anti-reflective coating on both sides
Fixed titanium bezel with aluminium insert
Screw-down titanium crown
Screw-down titanium back
Ultra-Chron logo stamped on the case back
Distance between lugs: 22 mm
Total weight (watch + bracelet): up to 80 g
Water-resistant up to 300 meters
Dial and hands
Sandblasted anthracite
12 applied silver indexes with Super-LumiNova® blue luminescence treatment
Original Ultra-Chron logo applied
Hands: Grey PVD (hours, minutes, seconds), with Super-LumiNova® (hours, minutes) blue luminescence treatment
Movement
High-frequency (5Hz) self-winding mechanical movement
Exclusive Longines calibre L836.6
Entire watch chronometer-certified by TIMELAB
Diameter: 11½ lines
Number of jewels: 25
Frequency: 36'000 vph (5 Hz)
Resistant to magnetism (ISO 764), with silicon balance spring
Power reserve: up to 52 hours
Functions/Indications
Hours, minutes, seconds
Strap and buckle
Black technical fabric, with titanium buckle
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🔴 Price : CHF 4'900 / USD 4,900 / £3,940 / €5,400 💰
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Press release - 2024
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For further information please contact:
Longines International Public Relations
2610 Saint-Imier, Switzerland
publicrelations@longines.com
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