Longines Ultra-Chron Titanium Carbon Case 43mm Automatic Anthracite Dial [L2.839.4.52.2]

The Longines Ultra-Chron Carbon Automatic 43 mm [L2.839.4.52.2] merges cutting-edge materials with horological refinement, drawing inspiration from the brand’s historic Ultra-Chron high-frequency watches of the late 1960s. This contemporary interpretation features a lightweight yet robust carbon case with titanium structure, offering strength without excess weight and presenting a distinctive cushion-shaped silhouette.

Originally introduced in 1968, the Longines Ultra-Chron was the first dive watch equipped with a high-frequency movement, underscoring the brand’s long-standing leadership in precision timekeeping. Longines’ expertise in high-beat technology dates back to 1910 and was further advanced in 1959 with the development of a record-setting observatory chronometer wristwatch. Today’s Ultra-Chron carries this legacy forward, drawing inspiration from the professional diving aesthetics of the original model while incorporating a chronometer-certified, high-frequency calibre with a silicon balance spring, offering enhanced accuracy, magnetic resistance, and long-term reliability.

The sandblasted anthracite dial is punctuated by applied silver indexes and toned hands treated with Super-LumiNova®for enhanced legibility in low light, with the original Ultra-Chron logo adding a signature touch. At its heart beats Longines’ exclusive high-frequency calibre L836.6, a chronometer-certified automatic movement running at 36,000 vibrations per hour and equipped with a monocrystalline silicon balance spring for magnetic resistance and stability. This high-beat architecture delivers remarkable precision and up to 52 hours of power reserve. 

The case is fitted with a scratch-resistant sapphire crystal with anti-reflective coating on both sides, and the fixed titanium bezel with aluminium insert enhances durability. With a robust 300 metres / 30 bar water resistance rating, this Ultra-Chron Carbon is built for performance in both daily wear and demanding environments.

Securing the watch to the wrist is a black technical fabric strap with a titanium buckle, combining comfort with a secure fit. Whether you’re drawn to its innovative carbon construction or its high-precision mechanical movement, this Ultra-Chron Carbon stands at the intersection of modern materials science and classic Swiss watchmaking.

Technical Specifications

• Brand: Longines
• Collection: Ultra-Chron Carbon
• Model: L2.839.4.52.2
• Movement: Automatic, self-winding mechanical (calibre L836.6)
• Chronometer: TIMELAB-certified chronometer
• Power Reserve: Up to 52 hours
• Frequency: 36,000 vph (5 Hz)
• Case Material: Carbon middle with titanium structure and fixed titanium bezel with aluminium insert
• Case Diameter: 43.00 mm
• Case Shape: Cushion
• Dial Colour: Anthracite sandblasted with applied silver indexes
• Hands: Grey PVD with Super-LumiNova® (hours, minutes)
• Crystal: Scratch-resistant sapphire with anti-reflective coating on both sides
• Functions: Hours, minutes, seconds
• Strap: Black technical fabric
• Clasp: Titanium buckle
• Water Resistance: 30 bar / 300 metres
• Warranty: 5-Year Longines International Warranty

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