Longines HydroConquest Hydroconquest Chronograph L688

Reference L3.696.4.13.6

About this watch

The Longines Hydroconquest Chronograph L688 is a masterpiece of luxury watchmaking that seamlessly blends functionality, style, and heritage. This Swiss-made timepiece boasts an impressive array of features, including a robust stainless steel case with a silver dial, Arabic numerals, and proprietary hands designed for maximum readability. The rotating bezel, with its 0-60 scale, is a functional piece of art that's perfect for measuring elapsed time while diving or engaging in other time-critical activities. At the heart of this watch lies the Longines caliber L688.2, an automatic movement that offers precision and reliability, with a frequency of 28,800 vibrations per hour and a power reserve of 54 hours. With its impressive water resistance of up to 300 meters, this watch is built to withstand the elements, making it perfect for both land-lovers and divers alike. Its sleek aesthetics and refined elegance make it suitable for any occasion, from casual to formal settings.
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Key Features

  • Longines caliber L688.2 automatic movement
  • Rotating bezel with 0-60 scale
  • Stainless steel case with silver dial
  • Arabic numerals and proprietary hands
  • Water resistance up to 300 meters
  • Sapphire crystal glass
  • 41.00 mm diameter

Specifications

Brand
Longines
Family
HydroConquest
Model
Hydroconquest Chronograph L688
Reference
L3.696.4.13.6
Movement
l688-2
Movement Features
  • Hours, Minutes, Small Seconds
  • Date
  • Chronograph, Column wheel
Case
Stainless Steel 41mm
Dial Color
Silver
Crystal
Sapphire
Water Resistance
300

Current Listings

[WTS] Longines Hydroconquest Blue 39mm - $1150

Longines Hydroconquest Blue 39mm - $1150

Longines - Hydroconquest · $1,150
A blue dial Longines Hydroconquest 39mm watch with a full kit, in excellent condition and keeping good time.

  • Condition: Great condition
  • Year purchased: 2025
  • Warranty duration: 5 years
Posted at
Mar 1, 2026, 8:14 PM
Active
[WTS] Longines Hydroconquest 41mm Two Tone

Longines Hydroconquest 41mm Two Tone

A Longines Hydroconquest 41mm Two Tone watch with a black dial and two tone finish. It is in very good condition with some minor wear.

  • Condition: Very Good Pre Owned Condition
  • Diameter: 41mm
Posted at
Feb 27, 2026, 3:34 PM
Active
[WTS] Longines HydroConquest GMT 41mm L3.790.4

Longines HydroConquest GMT 41mm L3.790.4

Longines - L3.790.4 · $1,799
This Longines HydroConquest GMT is a 41mm watch featuring a 6.5 inch bracelet and an aftermarket rubber strap with deployant.

  • Bracelet Length: 6.5 inches
  • Case Size: 41mm
Posted at
Feb 19, 2026, 5:35 PM
Active
[WTS] Longines HydroConquest 43mm Automatic – Black Dial – Full Kit – $1,095

Longines HydroConquest 43mm Automatic – Black Dial – Full Kit – $1,095

Longines - L3.782.4 · $1,095
This Longines HydroConquest automatic watch features a black dial and 43mm case size, which provides a strong wrist presence.

  • Condition: very good
  • Case size: 43mm diameter
  • Case wear: normal wear consistent with careful use
Posted at
Feb 18, 2026, 4:40 PM
Active
[WTS] Longines Hydroconquest 41m Green full kit with OEM bracelet and rubber strap

Longines Hydroconquest 41m Green full kit with OEM bracelet and rubber strap

A green ceramic automatic watch from Longines, part of the Hydroconquest series, featuring a Swiss movement with 72-hour power reserve.

  • Condition: Used with signs of wear
  • Case diameter: 41 mm
  • Water resistance: 300m / 30 bar
  • Movement: Longines Calibre L888 series with 72hr power reserve
Posted at
Feb 16, 2026, 4:12 PM
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