Longines HydroConquest 42 mm Automatic Black Dial Stainless Steel Watch [L3.788.4.90.6]

The Longines HydroConquest 42mm Automatic [L3.788.4.90.6] is a benchmark Swiss dive watch that combines robust engineering with refined aesthetics. Designed for both underwater performance and everyday wear, this model features a 42 mm stainless steel case paired with a black lacquered polished dial, delivering a clean, high-contrast look with exceptional legibility. 

Built for serious diving conditions, the HydroConquest is equipped with a unidirectional ceramic bezel, screw-in crown, and 300 m (30 bar) water resistance, ensuring reliability in demanding environments. A scratch-resistant sapphire crystal with anti-reflective coating on both sides enhances clarity while protecting the dial. 

At its core is a Longines automatic calibre (L888.5) beating at 25,200 vibrations per hour, delivering an impressive 72-hour power reserve and enhanced precision thanks to a silicon balance spring for improved resistance to magnetism. 

The stainless steel bracelet is finished with a double security folding clasp and micro-adjustment system, ensuring both comfort and security on the wrist. Combining sport functionality with Swiss elegance, the HydroConquest remains one of the most compelling luxury dive watches in its class.

Technical Specifications

• Brand: Longines
• Collection: HydroConquest
• Reference Number: L3.788.4.90.6
• Case Diameter: 42 mm 
• Case Material: Stainless steel with ceramic bezel 
• Dial Color: Black lacquered polished 
• 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 
• Bracelet: Stainless steel
• Clasp: Folding clasp with double security and micro-adjustment 

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