The Longines HydroConquest is a premium Swiss dive watch that combines professional-level capability with the refined finishing and timeless styling for which Longines is known. This brand-new and completely unworn example is reference L3.779.4.96.6, featuring a striking blue lacquered polished dial, matching blue ceramic dive bezel, and stainless steel bracelet.
At 39mm in diameter, this version of the HydroConquest offers exceptionally versatile proportions. It retains the substantial presence and capability expected from a professional dive watch while providing a more compact and comfortable profile suitable for everyday wear.
The blue lacquered polished dial is one of the highlights of this configuration, offering a rich appearance that changes subtly depending on the surrounding light. Large applied hour markers and the signature HydroConquest handset provide excellent legibility, while Swiss Super-LumiNova® enhances visibility in low-light conditions. A date complication adds useful everyday functionality.
Surrounding the dial is a unidirectional rotating bezel with a blue ceramic insert, creating a cohesive monochromatic appearance. Ceramic provides excellent resistance to scratches and fading while adding a refined finish that complements the polished lacquer dial.
Powering the HydroConquest is a Longines Swiss automatic mechanical movement operating at 25,200 vibrations per hour. The movement incorporates a monocrystalline silicon balance spring and provides an impressive power reserve of up to 72 hours, allowing the watch to remain running for approximately three days when fully wound.
Despite its refined appearance, the HydroConquest is engineered as a serious sports watch. Its screw-in crown, screw-down caseback, sapphire crystal, unidirectional bezel, and substantial 300-meter / 1,000-foot water resistance make it equally capable for recreational diving, travel, and everyday wear.
Specifications
Case
- Stainless Steel
- 39mm Case Diameter
- Brushed and Polished Finishing
- Screw-In Crown
- Screw-Down Caseback
- Robust Sports-Watch Construction
- Water Resistance: 300 Meters / 1,000 Feet / 30 Bar
- Swiss Made
Dial
- Blue Lacquered Polished Dial
- Applied Hour Markers
- Signature HydroConquest Hands
- Swiss Super-LumiNova®
- Luminous Hands and Hour Markers
- Central Seconds
- Date Display
- High-Contrast Dive-Watch Layout
Bezel
- Stainless Steel and Ceramic Bezel
- Blue Ceramic Insert
- Unidirectional Rotation
- Dive-Timing Scale
- Scratch-Resistant Ceramic Construction
- Designed for Professional Dive Timing
Crystal
- Scratch-Resistant Sapphire Crystal
- Several Layers of Anti-Reflective Coating
- Anti-Reflective Treatment on Both Sides
- Excellent Clarity in Changing Lighting Conditions
Movement
- Longines Swiss Automatic Mechanical Movement
- Self-Winding
- 25,200 Vibrations Per Hour
- Monocrystalline Silicon Balance Spring
- Up to 72 Hours of Power Reserve
- Hours, Minutes and Central Seconds
- Date Complication
- Swiss Made
Bracelet
- Longines Stainless Steel Bracelet
- Brushed and Polished Finishing
- Double-Security Folding Clasp
- Integrated Micro-Adjustment System
- Robust Construction for Everyday and Sports Use
Features
- Swiss Automatic Movement
- Up to 72-Hour Power Reserve
- Monocrystalline Silicon Balance Spring
- Blue Lacquered Polished Dial
- Matching Blue Ceramic Dive Bezel
- Unidirectional Rotating Bezel
- Scratch-Resistant Sapphire Crystal
- Multi-Layer Anti-Reflective Treatment on Both Sides
- Swiss Super-LumiNova®
- Screw-In Crown
- Screw-Down Caseback
- Date Complication
- 300M / 30 Bar Water Resistance
- Stainless Steel Bracelet
- Double-Security Folding Clasp
- Micro-Adjustment System
- Swiss Made
Additional Information
- Brand: Longines
- Collection: HydroConquest
- Reference: L3.779.4.96.6
- Dial: Blue Lacquered Polished
- Bezel: Blue Ceramic
- Case Material: Stainless Steel
- Case Size: 39mm
- Movement Type: Swiss Automatic
- Frequency: 25,200 Vibrations Per Hour
- Power Reserve: Up to 72 Hours
- Balance Spring: Monocrystalline Silicon
- Crystal: Sapphire with Multi-Layer AR Treatment on Both Sides
- Bracelet: Stainless Steel
- Clasp: Double-Security Folding Clasp with Micro-Adjustment
- Water Resistance: 300M / 1,000 Feet / 30 Bar
- Condition: Brand New & Unworn
- Made in Switzerland
The Longines HydroConquest has become one of the brand’s signature modern sports watches by successfully combining professional dive-watch specifications with the refinement expected from a Swiss luxury timepiece. In this 39mm configuration, that formula becomes especially versatile, providing serious capability without the additional bulk associated with many professional divers.
The blue lacquered polished dial and matching blue ceramic bezel give this particular reference a distinctive appearance. The polished dial interacts beautifully with changing light, while the ceramic bezel adds both visual depth and excellent resistance to everyday scratches and fading.
Mechanically, the watch benefits from a modern Swiss automatic movement with an impressive 72-hour power reserve and monocrystalline silicon balance spring. This provides approximately three days of running autonomy when fully wound while incorporating modern materials designed for dependable everyday performance.
The stainless steel bracelet completes the package with a secure double-security folding clasp and integrated micro-adjustment system, allowing the fit to be fine-tuned directly on the wrist.
Combined with its sapphire crystal, ceramic bezel, screw-in crown, Swiss Super-LumiNova®, 300-meter water resistance, and highly wearable 39mm proportions, this blue HydroConquest offers an excellent combination of Swiss watchmaking, professional dive capability, everyday versatility, and classic Longines design.
Condition: Brand new and completely unworn. Please carefully review all photographs, as they form an important part of the description and show the exact watch and everything included with the sale.
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