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 unworn example is reference L3.779.4.90.6, featuring a polished black lacquer dial, black ceramic dive bezel, and stainless steel bracelet.
At 39mm in diameter, this version of the HydroConquest offers particularly versatile proportions, providing the rugged presence of a professional dive watch while remaining compact and comfortable enough for everyday wear.
The polished black lacquer dial gives the watch a deep, refined appearance and provides excellent contrast against the large applied hour markers and signature HydroConquest handset. Swiss Super-LumiNova® provides strong low-light visibility, while the date complication adds everyday practicality without compromising the sporty design.
Surrounding the dial is a unidirectional rotating dive bezel with a ceramic insert. Ceramic provides excellent resistance to scratches and fading, making it particularly well suited to a watch designed for regular and demanding use.
Powering the HydroConquest is a Longines automatic mechanical movement operating at 25,200 vibrations per hour and equipped with a monocrystalline silicon balance spring. The movement provides an impressive up to 72 hours of power reserve, allowing the watch to remain running for approximately three days when fully wound.
Despite its refined appearance, the HydroConquest is a serious sports watch. A screw-in crown, screw-down caseback, sapphire crystal, unidirectional bezel, and substantial 300-meter / 1,000-foot water-resistance rating provide the capability expected from the HydroConquest collection.
Specifications
Case
- Stainless Steel
- 39mm Case Diameter
- Brushed and Polished Finishing
- Screw-In Crown
- Screw-Down Caseback
- Professional Sports-Watch Construction
- Water Resistance: 300 Meters / 1,000 Feet / 30 Bar
- Swiss Made
Dial
- Black 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
- Black Ceramic Insert
- Unidirectional Rotation
- Dive-Timing Scale
- Highly Scratch-Resistant Construction
- Designed for Professional Dive Timing
Crystal
- Scratch-Resistant Sapphire Crystal
- Multiple Layers of Anti-Reflective Coating
- Anti-Reflective Treatment Applied on Both Sides
- Designed for Excellent Visibility 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
- Black Polished Lacquer Dial
- Black Ceramic Dive Bezel
- Unidirectional Rotating Bezel
- Sapphire Crystal
- Multi-Layer Anti-Reflective Treatment
- 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: L3.779.4.90.6
- Dial: Black Lacquered Polished
- Bezel: Black 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
- 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 serious dive-watch specifications with the refinement of a Swiss luxury timepiece. This 39mm configuration makes that formula particularly versatile, offering excellent wrist presence without the additional bulk of a larger professional diver.
The polished black lacquer dial and matching ceramic bezel give the watch a timeless appearance that works equally well as a dedicated sports watch or an everyday luxury piece. The stainless steel bracelet completes the design while its double-security folding clasp and micro-adjustment system provide both security and practical on-wrist adjustment.
Mechanically, the combination of a 72-hour power reserve and monocrystalline silicon balance spring gives the HydroConquest a modern technical foundation, while the sapphire crystal, screw-in crown, ceramic bezel, and 300-meter water resistance ensure that its performance matches its appearance.
For someone looking for a versatile Swiss automatic diver, the 39mm HydroConquest delivers an impressive combination of Longines heritage, modern mechanical performance, professional water resistance, compact proportions, and classic styling.
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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