Longines HydroConquest HydroConquest 39 Automatic Stainless Steel / Blue / Bracelet / Star Navigation

Reference L3.675.4.96.6

About this watch

The Longines HydroConquest 39 Automatic is a statement piece that effortlessly combines style with high performance. With its stainless steel construction and vibrant blue dial, this watch exudes sophistication and durability. The proprietary hands add a touch of uniqueness, while the rotating bezel allows for precise timing of underwater activities. At the heart of the HydroConquest 39 is the Longines Caliber L633.5, boasting precision and durability with a frequency of 28,800 vibrations per hour. The addition of a date function further enhances its practicality, and the impressive water resistance of 300 meters makes it suitable for professional diving, swimming, and other water sports. Comfort is key, and this watch does not disappoint, featuring a secure clasp that ensures a perfect fit. With its blend of style, durability, and precision, the HydroConquest 39 stands tall in the world of luxury watches.
Buy Now on Jomashop
This is an affiliate link

Key Features

  • Stunning blue dial with stick and dot indexes
  • Robust Longines Caliber L633.5 automatic movement
  • 300-meter water resistance for diving enthusiasts
  • Sapphire glass for scratch resistance and durability
  • Adjustable stainless steel bracelet for comfort and style

Specifications

Brand
Longines
Family
HydroConquest
Model
HydroConquest 39 Automatic Stainless Steel / Blue / Bracelet / Star Navigation
Reference
L3.675.4.96.6
Movement
l633-5
Movement Features
  • Hours, Minutes, Seconds
  • Date
Case
Stainless Steel 39mm
Dial Color
Blue
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