Longines HydroConquest Hydroconquest Chronograph

Reference L3.644.4.56.6

About this watch

The Longines Hydroconquest Chronograph L3.644.4.56.6 is a stunning combination of style, functionality, and reliability. With its robust build, it promises durability while ensuring that you look good whether you’re at the beach or in a boardroom meeting. The case is made from high-quality stainless steel, creating a balanced presence on the wrist. The black dial features mixed indexes providing a sporty vibe while ensuring easy readability. The chronograph sub-dials are well-placed, making it simple to track time in various ways. At the core of this watch is the renowned ETA caliber 7750 automatic movement, celebrated for its reliability and precision. The sapphire glass ensures that the watch remains clear and legible no matter the conditions you put it through. With a water resistance rating of 300 meters, the Hydroconquest Chronograph is more than just a pretty face; it's a true diving companion.

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Key Features

41mm diameter stainless steel case
Sapphire glass for scratch resistance
Renowned ETA caliber 7750 automatic movement
Chronograph feature with easy-to-read sub-dials
Water resistance of up to 300 meters
Robust and durable design
Proprietary hands for a unique touch

Specifications

Brand

Longines

Family

HydroConquest

Model

Hydroconquest Chronograph

Reference

L3.644.4.56.6

Movement

7750

Movement Features

Hours, Minutes, Small Seconds
Date, Day
Chronograph

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

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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

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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

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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

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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

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