Longines HydroConquest Hydroconquest Quartz 39 Black / Red

Reference L3.688.4.59.6

About this watch

Welcome to our comprehensive review of the Longines Hydroconquest Quartz 39 Black / Red, model L3.688.4.59.6! This timepiece embodies luxury, precision, and adventure. With a rich history dating back to 1832, Longines has crafted a name synonymous with elegance and functionality. The Hydroconquest family personifies this ethos, featuring a bold design, scratch-resistant sapphire crystal glass, and an impressive water resistance of 300 meters. This quartz movement watch is highly reliable, offering precision that mechanical movements can only aspire to achieve. With a power reserve of approximately 26,280 seconds, you can expect it to keep ticking for a long time without the need for frequent adjustments. The rotating bezel allows easy tracking of dive time, while the date function adds practicality to its impressive design. Whether you're a seasoned diver or a casual watch enthusiast, this timepiece deserves a place in your collection.

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Key Features

Quartz movement with 26,280-second power reserve
300-meter water resistance for diving and swimming
Scratch-resistant sapphire crystal glass for protection
Rotating bezel for easy dive time tracking
Date function for added practicality

Specifications

Brand

Longines

Family

HydroConquest

Model

Hydroconquest Quartz 39 Black / Red

Reference

L3.688.4.59.6

Movement

l263

Movement Features

Hours, Minutes, Seconds
Date

Case

Stainless Steel 39mm

Dial Color

Black

Crystal

Sapphire

Water Resistance

300

Current Listings

2026 Longines HydroConquest 39mm - Black Ceramic - Newest Release - Full Set

Longines - L3.779.4.56.6 · $1,900

The newly redesigned Longines HydroConquest in the highly sought-after 39mm size, featuring a refined dial and upgraded bracelet.

Condition: Excellent Used Condition
Size: 39mm diameter
Thickness: ~11.9mm
Lug-to-lug length: 47mm

Posted at

May 7, 2026, 8:43 PM

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Longines Hydroconquest GMT 41mm

Longines - Hydroconquest GMT 41mm · $1,875

A black dial Longines Hydroconquest GMT watch with a 41mm case size, comes complete with a full set including a dated warranty card.

Condition: Pre-owned, minor signs of wear
Diameter: 41mm
Case material: unknown
Band: no details provided

Posted at

May 7, 2026, 3:36 PM

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Longines Hydroconquest 43mm L3.782.4.56.6-3 weeks owned.

Longines - L3.782.4.56.6 · $1,350

A Longines Hydroconquest 43mm watch on a black dial with a stainless steel bracelet, now on an Ali Rubber strap.

Condition: Mint condition, worn approximately 5 times
Case size: 43mm diameter
Lug to lug: 53mm
Thickness: 11.90mm

Posted at

May 7, 2026, 4:43 AM

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Longines Hydroconquest Quartz Two Tone L3.740.3.56.7 - $600 🚢

Longines - L3.740.3.56.7 · $600

This Longines Hydroconquest is a 41mm two-tone diver's watch with a quartz movement.

Condition: Used with light scratches
Size: 41mm diameter

Posted at

May 6, 2026, 9:43 PM

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2025 Longines Hydroconquest 41mm Ref: L37814056

Longines - L37814056 · $1,300

This listing is for a 2025 Longines Hydroconquest 41mm watch, featuring an automatic self-winding caliber L888.5, unidirectional green ceramic bezel, and 300M water resistance.

Condition: Like new with some minor marks on the bracelet and buckle
Case size: 41mm
Bracelet type: Stainless steel
Water resistance: 300m depth rating

Posted at

May 6, 2026, 8:37 PM

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Longines Hydroconquest 42 mm “Green” 2026

Longines - Hydroconquest 42mm · $1,800

Up for sale is one of my new Longines Hydroconquest 42mm watches, I purchased several but find myself gravitating towards other models.

Condition: New
Case size: 42mm diameter

Posted at

May 6, 2026, 7:28 PM

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(Longines) (2026 Hydroconquest 39mm Commonwealth) Brand New and Unworn

Longines - L3.779.4.09.9 · $2,650

This is a Limited Edition Hydroconquest Commonwealth Games watch from Longines, purchased brand new from an authorized dealer and still under warranty.

Case diameter: 39mm
Box condition: great condition with exception of price sticker on outer box

Posted at

May 6, 2026, 5:30 PM

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Longines HydroConquest 39mm Black Dial – 2026 Model, Worn Once. $1,995

Longines - HydroConquest 2026 Model · $1,995

A Longines HydroConquest with a black dial and steel bracelet for sale. It's the latest iteration from 2026, purchased recently but only worn once to a wedding.

Condition: Near mint, worn once
Case size: 39mm
Movement: Automatic

Posted at

May 4, 2026, 12:18 PM

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