Longines HydroConquest Hydroconquest Chronograph L688

Reference L3.696.4.59.2

About this watch

The Longines HydroConquest Chronograph L688 is a luxury watch that embodies the perfect blend of functionality and style. Since its launch in 2013, this remarkable timepiece has carved a niche for itself among watch enthusiasts. At the heart of the L688 lies the Longines caliber L688.2, an automatic movement with a 54-hour power reserve and 28,800 vibrations per hour. The stainless steel case provides durability and elegance, while the rotating bezel is designed for divers with a 0-60 scale. The sapphire crystal offers scratch-resistance, ensuring your watch remains pristine even after years of use. One of its standout features is the chronograph function, operated via pushers on the side of the watch, perfect for timing various activities. With an impressive water resistance of 300 meters, this watch can handle both diving adventures and everyday wear with ease.

Buy Now on Jomashop

This is an affiliate link

Key Features

Automatic movement (Longines caliber L688.2)
54-hour power reserve
Stainless steel case with rotating bezel
Scratch-resistant sapphire crystal
Chronograph function with column wheel mechanism
300-meter water resistance
41mm diameter stainless steel bracelet

Specifications

Brand

Longines

Family

HydroConquest

Model

Hydroconquest Chronograph L688

Reference

L3.696.4.59.2

Movement

l688-2

Movement Features

Hours, Minutes, Small Seconds
Date
Chronograph, Column wheel

Case

Stainless Steel 41mm

Dial Color

Black

Crystal

Sapphire

Water Resistance

300

Current Listings

(Longines) (2026 Hydroconquest 42) Full 5 Year Warranty, LNIB

Longines - Hydroconquest 42 · $2,200

This newly released Longines Hydroconquest is a large watch with exceptional fit and finish. It comes in its original packaging with a full kit and warranty.

Condition: LNIB (Like New In Box)
Case size: 42mm
Water resistance: not specified

Posted at

Apr 13, 2026, 2:48 PM

Active

View listing on r/WatchExchange

Longines Hydroconquest 43mm Full Black Ceramic Ref L3.784.4.56.9 MINT Full Kit $2500

Longines - L3.784.4.56.9 · $2,500

This Longines HydroConquest features a unique full black ceramic aesthetic with a sleek and stealthy design, while maintaining refined and versatile qualities. The watch boasts excellent scratch resistance, legible dial, and comfortable daily wear.

Condition: MINT
Case diameter: 43mm
Thickness: 13mm
Lug-to-lug length: 56mm

Posted at

Apr 10, 2026, 8:26 PM

Active

View listing on r/WatchExchange

Longines Hydroconquest GMT | 41mm | Sunburst Brown | Excellent Condition

Longines - Hydroconquest GMT · $1,350

This Longines Hydroconquest GMT is a refresh of the well-loved hydroconquest line range, featuring a new quick-adjust bracelet and updated bezel with brown ceramic insert. The sunray dial looks incredible in all lighting conditions, especially when exposed to sunlight.

Condition: Excellent
Case size: 41mm diameter
Lug to lug: 49.2mm
Thickness: 12.8mm

Posted at

Apr 8, 2026, 5:34 PM

Active

View listing on r/WatchExchange

Longines HydroConquest 2 tone Green Dial 2024 $1320

Longines - HydroConquest 2 tone Green Dial 2024 · $1,320

Image: https://imgur.com/a/bPjxHRP

Posted at

Apr 7, 2026, 9:36 AM

Active

View listing on r/WatchExchange

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

View listing on RolexForums