Longines HydroConquest Hydroconquest Chronograph L688

Reference L3.696.4.03.6

About this watch

The Longines Hydroconquest Chronograph L688 is a stunning timepiece that combines elegance with functionality, perfect for both adventure and style. With its vibrant blue dial and stainless steel case, this watch exudes durability and luxury, like wearing a piece of the sea on your wrist. The clean and legible dial features Arabic numerals and proprietary hands, while the date function is conveniently positioned. The rotating bezel allows for easy tracking of elapsed time underwater, making it a standout feature for diving enthusiasts. With its robust performance, stunning aesthetics, and impressive water resistance, this watch checks all the boxes for both watch enthusiasts and casual wearers. Whether you're looking for a timepiece that tells time or a story, the Hydroconquest L688 offers incredible value for its price, delivering on performance, style, and durability.
Buy Now on Jomashop
This is an affiliate link

Key Features

  • Stainless Steel Case
  • Automatic Chronograph Movement (Longines Caliber L688.2)
  • 300 Meters Water Resistance
  • 41mm Diameter Stainless Steel Bracelet
  • Rotating 0-60 Dive Bezel
  • Sapphire Glass
  • Blue Dial with Arabic Numerals and Proprietary Hands

Specifications

Brand
Longines
Family
HydroConquest
Model
Hydroconquest Chronograph L688
Reference
L3.696.4.03.6
Movement
l688-2
Movement Features
  • Hours, Minutes, Small Seconds
  • Date
  • Chronograph, Column wheel
Case
Stainless Steel 41mm
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