Longines HydroConquest 42mm Automatic Black Dial Steel Bracelet [L3.788.4.56.6]

The Longines HydroConquest 42mm Automatic [L3.788.4.56.6] represents the modern Swiss dive watch at its most refined, combining professional-grade engineering with a clean, contemporary design. Its black dial delivers strong contrast and legibility, enhanced by luminous markers and hands for optimal visibility in all conditions.

Built for performance, the watch features a 42 mm stainless steel case, unidirectional ceramic bezel, and screw-in crown, ensuring durability and precision under pressure. With 300 m (30 bar) water resistance and a scratch-resistant sapphire crystal with anti-reflective coating on both sides, it is engineered for serious underwater use while remaining perfectly suited for daily wear. 

Powering the watch is the Longines Calibre L888.5 automatic movement, beating at 25,200 vibrations per hour and offering a robust 72-hour power reserve. The inclusion of a silicon balance spring enhances resistance to magnetic interference and ensures long-term accuracy and reliability. 

The watch is completed with a stainless steel bracelet in a classic H-link construction, fitted with a double security folding clasp with micro-adjustment system, delivering a secure and comfortable fit. This configuration represents the most traditional and sport-driven expression of the HydroConquest line.

Technical Specifications

• Brand: Longines
• Collection: HydroConquest
• Reference Number: L3.788.4.56.6
• Case Diameter: 42 mm
• Case Material: Stainless steel with ceramic bezel
• Dial Color: Black
• Movement: Automatic (Longines Calibre L888.5)
• Power Reserve: ~72 hours
• Balance Spring: Silicon (anti-magnetic)
• Functions: Hours, minutes, seconds, date
• Bezel: Unidirectional rotating ceramic bezel
• Crystal: Scratch-resistant sapphire with anti-reflective coating on both sides
• Water Resistance: 300 m / 30 bar
• Crown: Screw-in crown
• Caseback: Screw-down
• Bracelet: Stainless steel (H-link bracelet)
• Clasp: Double security folding clasp with micro-adjustment

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