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2026 Longines HydroConquest Automatic 42mm Black Ref. - L3.788.4.56.6
2026 Longines HydroConquest Automatic 42mm Black Ref. - L3.788.4.56.6 - Image 2
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2026 Longines HydroConquest Automatic 42mm Black Ref. – L3.788.4.56.6

Original price was: $2,200.00.Current price is: $2,050.00.

Availability: In stock

SKU: L3.788.4.56.6 Categories: , , ,

The Longines HydroConquest is a benchmark among Swiss luxury dive watches, combining elegant design with true professional diving capability. Featuring a sleek black lacquered dial, a scratch-resistant black ceramic bezel, and a robust stainless steel case, the HydroConquest is equally at home underwater, in the office, or as an everyday luxury sports watch. Its refined proportions and premium finishing make it one of the most versatile timepieces in the Longines lineup.

This pre-owned example is in mint condition, showing only minimal signs of wear and presenting beautifully throughout. Powered by the exclusive Longines Calibre L888.5 automatic movement with a silicon balance spring, it offers an impressive 72-hour power reserve, enhanced magnetic resistance, and exceptional reliability. With 300 meters of water resistance, a sapphire crystal with anti-reflective coating on both sides, and a micro-adjustable stainless steel bracelet, the HydroConquest is built to perform in every environment.

Specifications
Case

  • Stainless Steel Case
  • 42mm Case Diameter
  • 11.7mm Thickness
  • 51.2mm Lug-to-Lug
  • 21mm Lug Width
  • Black Ceramic Unidirectional Rotating Bezel
  • Sapphire Crystal with Multi-Layer Anti-Reflective Coating on Both Sides
  • Screw-Down Crown
  • Screw-Down Case Back
  • Water Resistance: 300 Meters (30 Bar)

Dial

  • Black Lacquered Dial
  • Applied Rhodium-Plated Hour Markers
  • Rhodium-Plated Hands
  • Swiss Super-LumiNova on Hands and Markers
  • Date Display at 3 O’Clock

Movement

  • Longines Calibre L888.5
  • Swiss Automatic Movement
  • Silicon Balance Spring
  • 21 Jewels
  • 25,200 Vibrations per Hour
  • 72-Hour Power Reserve
  • Hours, Minutes, Seconds, Date

Bracelet

  • Stainless Steel Bracelet
  • Double-Folding Safety Clasp
  • Push-Button Release
  • On-the-Fly Micro-Adjustment System

Features

  • Swiss Made
  • Ceramic Dive Bezel
  • Silicon Balance Spring
  • Sapphire Crystal
  • Screw-Down Crown
  • 300M Water Resistance
  • Exceptional Everyday Sports Watch

Additional Information

  • Brand: Longines
  • Collection: HydroConquest
  • Reference: L3.788.4.56.6
  • Condition: Pre-Owned, Mint Condition
  • Display: Analog
  • Country of Origin: Switzerland

Brand

Longines

Longines is a prestigious Swiss watch brand with a rich heritage rooted in precision, elegance, and sporting excellence. With a history spanning over a century, Longines is known for producing refined timepieces that balance classic design with modern watchmaking technology.

The brand offers a diverse range of watches, including elegant dress models, professional dive watches, and chronographs inspired by aviation and sports timing. Longines watches often feature Swiss automatic movements, finely finished cases, and timeless dial designs.

At Radiant Wrist, we present a curated collection of authentic Longines watches for those who value tradition, craftsmanship, and understated luxury. Shop with confidence and enjoy fast U.S. shipping on every order.

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Warranty

Radiant Wrist is an independent watch retailer and is not an authorized dealer for certain brands sold on this website, including Tissot. Manufacturer warranties may not apply.

When a manufacturer warranty is not applicable, Radiant Wrist INC provides its own 2-year limited store warranty covering defects in materials and workmanship under normal use. Pre-owned watches are sold as is, without warranty, and may show signs of wear.

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