Longines HydroConquest Hydroconquest Automatic 39 Black

Reference L3.641.4.56.6

About this watch

The Longines Hydroconquest Automatic 39 Black is a testament to the perfect fusion of functionality and sophistication, designed for both adventure and elegance. With its stunning black dial and striking stick and dot indexes, it offers a beautiful contrast that catches the light beautifully. The 39mm stainless steel case strikes a perfect balance between robust and refined, making it comfortable for everyday wear while still being tough enough for underwater adventures. At the core of this timepiece lies the Longines caliber L633.5, an automatic movement based on the renowned ETA 2824-2. This movement is celebrated for its reliability and accuracy, ensuring precise timekeeping with a frequency of 28,800 vibrations per hour. The Hydroconquest boasts a power reserve of approximately 38 hours, making it ideal for everyday wear. With a water resistance rating of 300 meters, this watch is designed to handle the pressure of aquatic activities. Its rotating bezel with a 0-60 scale allows you to track elapsed time underwater, ensuring your safety while looking incredibly stylish.
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Key Features

  • 39mm stainless steel case
  • Longines caliber L633.5 automatic movement
  • Sapphire crystal glass for scratch resistance
  • 300m water resistance
  • Rotating 0-60 bezel for dive tracking
  • Stainless steel bracelet with adjustable clasp

Specifications

Brand
Longines
Family
HydroConquest
Model
Hydroconquest Automatic 39 Black
Reference
L3.641.4.56.6
Movement
l633-5
Movement Features
  • Hours, Minutes, Seconds
  • Date
Case
Stainless Steel 39mm
Dial Color
Black
Crystal
Sapphire
Water Resistance
300

Current Listings

[WTS] Longines Hydroconquest GMT, Ref: L3.790.4.96.6, 41mm

Longines Hydroconquest GMT, Ref: L3.790.4.96.6, 41mm

Longines - L3.790.4.96.6 · $1,825
The Longines Hydroconquest GMT features a stainless steel case with blue ceramic bezel and a blue dial.

  • Condition: preowned with minor desk rash on bracelet
  • Case size: 41mm diameter
  • Bezel material: blue ceramic
  • Bracelet material: stainless steel
Posted at
Nov 30, 2025, 4:59 PM
Active
[WTS] Longines HydroConquest Automatic 43mm Date l3.782.4.96.6

Longines HydroConquest Automatic 43mm Date l3.782.4.96.6

Longines - L37824-966 · $960
A Longines HydroConquest 43mm Automatic in blue with ceramic, unidirectional rotating bezel, a solid stainless steel case, and water resistance up to 300 meters.

  • Condition: Excellent, used maybe 5 times since new
  • Case size: 43mm diameter
  • Depth rating: 300m
Posted at
Nov 30, 2025, 12:17 PM
Active
[WTS] Longines Hydroconquest 41mm Sunray Grey Ref L3.782.4.76.6 Full Kit plus extra strap $950

Longines Hydroconquest 41mm Sunray Grey Ref L3.782.4.76.6 Full Kit plus extra strap $950

The Longines HydroConquest features a stunning sunray grey dial that shifts beautifully under light, giving it a sleek, modern look that works equally well dressed up or down. The watch wears comfortably at 41mm and the proportions make it a great everyday piece that still feels special on the wrist.

  • Condition: Great shape overall, with only light surface wear on the case and bracelet
  • Case size: 41mm diameter
  • Lug to lug length: 51mm
  • Thickness: 11.9mm
Posted at
Nov 29, 2025, 11:32 AM
Active
Longines HydroConquest, L3.781.4.06.9, Steel Diver, Olive, Excellent Condition.

Longines HydroConquest, L3.781.4.06.9, Steel Diver, Olive, Excellent Condition.

Longines - L3.781.4.06.9 · $1,095
This Longines HydroConquest is a steel diver's watch with an olive green matte dial and a unidirectional rotating ceramic bezel. The stainless steel case measures 41mm in diameter and has a water resistance of up to 300 meters.

  • Condition: Excellent Condition
  • Case Diameter: 41mm
  • Thickness: 11.9mm
  • Bezel Type: Unidirectional rotating Green Ceramic
Posted at
Feb 5, 2025, 2:47 AM
Active