Longines Ultra-Chron Automatic 43 mm Black Dial Stainless Steel Bracelet [L2.836.4.52.6]

The Longines Ultra-Chron Automatic 43 mm [L2.836.4.52.6] is a standout example of technical performance and heritage-inspired design. Drawing inspiration from Longines’ original Ultra-Chron Diver of 1968, this modern interpretation fuses classic dive aesthetics with cutting-edge watchmaking technology. It features a black dial with applied hour indexes and hands treated with Swiss Super-LumiNova® for enhanced legibility in low-light conditions. The unidirectional rotating bezel and screw-in crown signal its practical sporting heritage, while the stainless steel caseoffers robust durability.

At its core beats Longines’ exclusive high-frequency automatic movement (Calibre L836), which oscillates at 36,000 vibrations per hour (5 Hz) and is equipped with a monocrystalline silicon balance spring for improved magnetic resistance and consistent timekeeping. This high-beat calibre delivers a power reserve of approximately 52 hours and has been certified at the highest levels of accuracy — capturing Longines’ long history of precision watchmaking.

The watch is fitted with a stainless steel bracelet secured by a triple safety folding clasp with push-piece opening mechanism, combining comfort and confidence on the wrist. A scratch-resistant sapphire crystal with multi-layer anti-reflective coating and water resistance to 30 bar (300 metres) further reinforce its capability as a versatile sports timepiece, suitable for both everyday and active wear.

Also available on a brown leather strap with stainless steel deployment buckle here.

Technical Specifications

• Brand: Longines
• Collection: Ultra-Chron
• Model: L2.836.4.52.6
• Movement: Automatic, high-frequency mechanical (Calibre L836)
• Frequency: 36,000 vibrations per hour (5 Hz)
• Power Reserve: Approx. 52 hours
• Case Material: Stainless steel
• Case Diameter: 43.00 mm
• Dial Colour: Black with Swiss Super-LumiNova®
• Hands: Polished with Super-LumiNova®
• Crystal: Scratch-resistant sapphire with anti-reflective coating
• Functions: Hours, minutes, seconds
• Bezel: Unidirectional rotating
• Bracelet: Stainless steel
• Clasp: Triple safety folding clasp with push-piece opening mechanism
• Water Resistance: 30 bar / 300 metres
• Warranty: 5-Year Longines International Warranty

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