Longines HydroConquest Hydroconquest Chronograph Tachymeter Silver

Reference L3.651.4.76.6

About this watch

The Longines Hydroconquest Chronograph Tachymeter Silver is a remarkable timepiece that seamlessly blends style, functionality, and durability. This stunning piece from Longines boasts a captivating design and powerful features that make it perfect for both underwater adventures and formal occasions. The watch's impressive water resistance of up to 300 meters and high-quality sapphire glass ensure its durability and scratch resistance. The reliable automatic movement, based on the ETA 7750, provides accuracy and robustness with a frequency of 28,800 vibrations per hour and a 42-hour power reserve. The chronograph feature is a standout aspect, allowing for precise timing of dives or any activity where timing is crucial. With its sleek aesthetic and sporty yet sophisticated appeal, this watch is an investment in quality and craftsmanship that stands the test of time.

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Key Features

41mm Stainless Steel Case
Sapphire Glass with Scratch Resistance
300m Water Resistance
Longines Caliber L667 Automatic Movement
Chronograph Functionality
Rotating Dive Bezel (0-60)
Stainless Steel Bracelet

Specifications

Brand

Longines

Family

HydroConquest

Model

Hydroconquest Chronograph Tachymeter Silver

Reference

L3.651.4.76.6

Movement

l667

Movement Features

Hours, Minutes, Small Seconds
Date
Chronograph

Case

Stainless Steel 41mm

Dial Color

Silver

Crystal

Sapphire

Water Resistance

300

Current Listings

NEW RELEASE 2026 Longines HydroConquest L37794566 Full Set $2,000

Longines - L37794566 · $2,000

A newly released dive watch combining modern design with Longines’ proven sport watch heritage, featuring a clean and highly legible dial paired with a robust case.

Condition: Like new
Case size: 41mm
Case material: Stainless steel
Movement: Automatic

Posted at

Apr 24, 2026, 12:38 PM

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New Longines HydroConquest 42mm

Longines - HydroConquest 42mm · $2,050

A new Longines HydroConquest in the 42mm size, with a mesh band and box and papers included.

Condition: New
Case Size: 42mm
Band Type: mesh

Posted at

Apr 23, 2026, 8:54 AM

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Longines Hydroconquest Chronograph 41 Ref. L3.783.4 – Travel Box & Manual | $1,850

Longines - L3.783.4 · $1,850

The Longines Hydroconquest Chronograph is a high-performance Swiss diver's watch that features a 41mm case, blue ceramic bezel, and screw-down crown. It houses the calibre L688.2, a column-wheel chronograph movement with a 54-hour power reserve.

Condition: Very good with minor usage marks
Case Size: 41 x 51mm stainless steel case with a thickness of 15.6mm and a lug width of 21mm
Movement: Longines L688.2, automatic column wheel chronograph with 27 jewels, 28,800 bph, and a 54-hour power reserve
Water Resistance: 300 (30 ATM)

Posted at

Apr 22, 2026, 3:35 PM

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Longines HydroConquest GMT 41mm Black, Full Kit, June 2025

Longines - HydroConquest GMT · $1,980

Up for sale is my mint condition Longines HydroConquest GMT, a full kit with box, papers, tags, and over 4 years left on the factory warranty.

Condition: Mint condition
Case dimensions: 41mm diameter, 49mm lug to lug, 12.9mm thickness
Movement: L844.5 with 72hrs power reserve
Water resistance: 300m

Posted at

Apr 19, 2026, 10:47 PM

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Longines Hydroconquest 39mm Black MINT

Longines - Hydroconquest 39mm Black · $2,200

A mint condition Longines Hydroconquest 39mm in black with a super comfortable bracelet and excellent bezel action.

Condition: MINT
Bracelet type: Super comfortable bracelet
Clasp type: Excellent on the fly clasp
Bezel action: Great bezel action

Posted at

Apr 19, 2026, 9:12 AM

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Longines HydroConquest 39mm Green Ceramic Bezel 2026 NEW L3.779.4.06.6 – $2800 + shipping

Longines - L3.779.4.06.6 · $2,800

This Longines HydroConquest features a stunning green ceramic bezel and matching dial, with a 39mm size that wears well on the wrist.

Condition: Brand new
Case Size: 39mm diameter
Bezel Material: green ceramic

Posted at

Apr 17, 2026, 6:00 AM

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2026 Longines Hydroconquest 39mm - Grey Bezel / Black Dial

Longines - L3-779-4-70-6 · $2,100

This 2026 Longines Hydroconquest is a 39mm grey bezel/black dial watch, purchased directly from Longines and regularly worn. It's free of major scratches or dents but has minor wear on the back of one lug.

Condition: Excellent to LNIB (like new in box)
Bracelet length: up to an 8in wrist
Bent link pin: one link pin is bent and unusable
Included accessories: all original packaging, accessories, and paperwork

Posted at

Apr 16, 2026, 3:09 PM

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Longines HydroConquest Sunray Blue- L3.790.4.96.6

Longines - L3.790.4.96.6 · $2,900

A brand new Longines HydroConquest with sunray blue dial, featuring a new box and papers.

Condition: Brand new
Box And Papers: brand new

Posted at

Apr 16, 2026, 12:11 PM

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[WTS] Longines HydroConquest GMT - Unworn, Full Set, Black Dial 41mm. The watch is in completely unworn condition and comes as a full set including box, papers, and all original accessories. Price:1700. UK-based. Happy to ship or meet depending on location. Dm if interested

Longines HydroConquest GMT - Unworn, Full Set, Black Dial 41mm. The watch is in completely unworn condition and comes as a full set including box, papers, and all original accessories. Price:1700. UK-based. Happy to ship or meet depending on location. Dm if interested

Longines - HydroConquest GMT · $1,700

The Longines HydroConquest GMT is a 41mm timepiece that comes as a full set including box, papers, and all original accessories. It is in completely unworn condition.

Condition: Unworn
Case Size: 41mm
Set: Full set including box, papers, and all original accessories

Posted at

Apr 16, 2026, 11:26 AM

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