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 L3.779.4.70.6, 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. It retains the rugged presence and capability expected from a professional dive watch while offering a more compact profile that works exceptionally well for everyday wear.
The black lacquered polished dial provides a deep, elegant backdrop for the large applied hour markers and signature HydroConquest handset. Swiss Super-LumiNova® provides excellent visibility in low-light conditions, while the date complication adds everyday practicality without distracting from the clean sports-watch aesthetic.
Surrounding the dial is a unidirectional rotating bezel with a ceramic insert. The ceramic construction provides excellent resistance to scratches and fading while giving the watch a more refined appearance than a traditional aluminum dive bezel.
Powering the HydroConquest is a Longines Swiss automatic mechanical movement operating at 25,200 vibrations per hour. Equipped with a monocrystalline silicon balance spring, the movement offers enhanced resistance to magnetic fields and provides an impressive up to 72 hours of power reserve.
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 provide the robust construction expected from the HydroConquest collection.
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
- 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
- Black 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
- Black Lacquered Polished Dial
- Black Ceramic Dive Bezel
- Unidirectional Rotating Bezel
- 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: L3.779.4.70.6
- 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 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 established itself as one of the brand’s signature modern sports watches by combining serious dive-watch specifications with the refinement expected from a Swiss luxury timepiece. In this 39mm configuration, that formula becomes especially versatile, delivering substantial capability without the bulk of a larger professional diver.
The combination of the polished black lacquer dial and matching black ceramic bezel gives this reference a timeless monochromatic appearance. It can easily transition from casual everyday use to more formal environments while retaining all the functionality expected from the HydroConquest name.
Mechanically, the watch benefits from a modern Swiss automatic movement with a 72-hour power reserve and monocrystalline silicon balance spring. This allows the watch to remain running for approximately three days when fully wound while providing improved resistance to the magnetic fields commonly encountered in everyday life.
The stainless steel bracelet completes the package with a secure double-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 HydroConquest offers an impressive balance of Swiss watchmaking, professional dive capability, everyday comfort, and timeless 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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