Longines HydroConquest Hydroconquest Chronograph Tachymeter

Reference L3.651.4.16.6

About this watch

The Longines HydroConquest L3.651.4.16.6 is a robust and stylish diver's watch that combines performance with elegance. Its 41mm stainless steel case features a rotating bezel, marked from 0 to 60, for precise timing underwater. The sapphire crystal glass is scratch-resistant and adds to the watch's durability. A closed case back limits visibility of the movement but adds to the watch's sturdiness. With a lug width of 21mm, the Hydroconquest comes with a well-crafted stainless steel bracelet that feels solid yet comfortable on the wrist. The chronograph feature is a highlight, providing additional functionality for timing events. The date function ensures you're always on top of your schedule. Whether diving or just out for a casual lunch, this watch feels right at home. Its impressive 300m water resistance makes it a reliable companion for underwater adventures. With a reliable and accurate automatic movement, the Hydroconquest keeps time with impressive accuracy. A power reserve of 42 hours ensures you can take it off for a day or two without worrying about winding it again. The Longines HydroConquest is more than just a watch; it's a statement piece that combines performance with elegance.
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Key Features

  • Longines caliber L667 automatic movement
  • 41mm stainless steel case with rotating bezel
  • Sapphire crystal glass for scratch-resistance and durability
  • 300m water resistance for underwater adventures
  • Chronograph feature for timing events
  • Date function for scheduling
  • 42-hour power reserve for reliability

Specifications

Brand
Longines
Family
HydroConquest
Model
Hydroconquest Chronograph Tachymeter
Reference
L3.651.4.16.6
Movement
l667
Movement Features
  • Hours, Minutes, Small Seconds
  • Date
  • Chronograph
Case
Stainless Steel 41mm
Dial Color
White
Crystal
Sapphire
Water Resistance
300

Current Listings

Longines Hydroconquest Automatic

Longines Hydroconquest Automatic

The Longines Hydroconquest is a comfortable and reliable automatic watch. It features a 41mm case size with a blue aluminum bezel and dial.

  • Condition: Pre-owned, has been worn
  • Case Size: 41mm
  • Bezel Fade: yes, but lines up properly
  • Wrist Size Fit: 7 7/8 inch wrist
Posted at
Jun 14, 2025, 3:19 PM
Active
>>REDUCED<< LONGINES HYDROCONQUEST ALL CERAMIC L3.784.4

>>REDUCED<< LONGINES HYDROCONQUEST ALL CERAMIC L3.784.4

Longines - L3.784.4 · $1,995.002
This Longines HydroConquest All Ceramic features a ceramic case and bezel, black ZrO2 dial, and is water resistant to 300m. The watch has a 43mm diameter and comes with a rubber strap and deployant clasp.

  • Condition: MINT
  • Case material: ceramic
  • Diameter: 43mm
  • Water resistance: 300m
Posted at
Jun 13, 2025, 4:41 PM
Active
[WTS] Longines Hydroconquest GMT 41mm Sunray Blue

Longines Hydroconquest GMT 41mm Sunray Blue

A Longines Hydroconquest GMT with a Sunray blue dial and ceramic bezel in a beautiful pre-owned condition.

  • Condition: Very nice pre-owned condition, some minor hairlines on the bracelet/clasp
  • Diameter: 41mm
  • Bezel material: ceramic
Posted at
Jun 13, 2025, 8:34 AM
Active
[WTS] Longines HydroConquest 39mm Ceramic Bezel (Like New. 5 Years of Factory Warranty)

Longines HydroConquest 39mm Ceramic Bezel (Like New. 5 Years of Factory Warranty)

Longines - L37804.96.6 · $1,300
A Longines HydroConquest 39mm watch with a ceramic bezel, purchased from an authorized dealer in Florence, Italy and barely worn.

  • Condition: Like new
  • Warranty: 5 years remaining
  • Case Size: 39mm
Posted at
Jun 12, 2025, 3:35 PM
Active
REDUCED Longines HydroConquest 41mm Blue Automatic

REDUCED Longines HydroConquest 41mm Blue Automatic

Longines - HydroConquest · £300.003
The Longines HydroConquest is a blue automatic watch from 2024, purchased brand new with all original box and papers. It features the newest movement, keeping excellent time.

  • Condition: nearly new
  • Movement: ETA C07.621
  • Water Resistance: 300m
Posted at
Jun 8, 2025, 7:04 PM
Active
Longines HydroConquest 41mm Blue

Longines HydroConquest 41mm Blue

· £650.007
Posted at
Jun 8, 2025, 7:04 PM
Active
REDUCED Longines HydroConquest 41mm Blue

REDUCED Longines HydroConquest 41mm Blue

Longines - HydroConquest 41mm · £600.006
This Longines HydroConquest 41mm Blue is a men's watch that features the newest movement, keeping excellent time with a +1.3spd deviation.

  • Condition: Nearly new condition
  • Purchase Year: 2024
  • Warranty Status: Full warranty
  • Movement Accuracy: +1.3spd
Posted at
Jun 8, 2025, 7:04 PM
Active
LONGINES HYDROCONQUEST ALL CERAMIC L3.784.4

LONGINES HYDROCONQUEST ALL CERAMIC L3.784.4

Longines - L3.784.4 · $2,150.002
A black ZrO2 dial Longines HydroConquest All Ceramic watch with a ceramic case and bezel, 43mm in diameter, water resistant to 300m.

  • Condition: MINT
  • Case material: ceramic
  • Diameter: 43mm
  • Water resistance: 300m depth rating
Posted at
Jun 7, 2025, 2:44 PM
Active
Longines Hydroconquest GMT FSOT

Longines Hydroconquest GMT FSOT

Longines - L844 · $1,600.002
A Longines Hydroconquest GMT with a blue dial and 41mm x 49.5 x 12.9mm dimensions, featuring a traveler-style GMT function and a tapering bracelet.

  • Condition: like-new, near flawless
  • Movement: L844
  • Bph: 25.2
Posted at
Jun 6, 2025, 4:06 PM
Active