Longines HydroConquest Hydroconquest Chronograph Tachymeter Black

Reference L3.651.4.56.6

About this watch

The Longines HydroConquest Chronograph Tachymeter Black is a testament to the brand's dedication to creating timepieces that combine functionality, style, and durability. Its striking black dial exudes a sporty yet sophisticated vibe, making it a versatile option for both casual outings and formal events. The watch features a robust movement based on the ETA/Valjoux 7750, boasting a 42-hour power reserve and a frequency of 28,800 vibrations per hour. With its impressive water resistance of 300 meters and sapphire glass protection, this watch is designed to withstand underwater activities while remaining stylish enough for everyday wear. The stainless steel bracelet adds to its luxurious feel, ensuring comfort throughout the day. Whether you're deep-sea diving or just going about your day, you can trust this watch to keep you on schedule. With a diameter of 41.00 mm, it strikes a balance between being prominent on the wrist without feeling bulky.
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Key Features

  • Longines caliber L667 automatic movement
  • 300m water resistance with sapphire glass protection
  • Stainless steel case with rotating dive bezel
  • Black dial with stick and dot indexes
  • Chronograph function with three sub-dials
  • 42-hour power reserve and 28,800 vibrations per hour
  • 41.00 mm diameter and 21.00 mm lug width

Specifications

Brand
Longines
Family
HydroConquest
Model
Hydroconquest Chronograph Tachymeter Black
Reference
L3.651.4.56.6
Movement
l667
Movement Features
  • Hours, Minutes, Small Seconds
  • Date
  • Chronograph
Case
Stainless Steel 41mm
Dial Color
Black
Crystal
Sapphire
Water Resistance
300

Current Listings

[WTS] Longines Hydroconquest GMT, Ref: L3.790.4.96.6, 41mm

Longines Hydroconquest GMT, Ref: L3.790.4.96.6, 41mm

Longines - L3.790.4.96.6 · $1,825
The Longines Hydroconquest GMT features a stainless steel case with blue ceramic bezel and a blue dial.

  • Condition: preowned with minor desk rash on bracelet
  • Case size: 41mm diameter
  • Bezel material: blue ceramic
  • Bracelet material: stainless steel
Posted at
Nov 30, 2025, 4:59 PM
Active
[WTS] Longines HydroConquest Automatic 43mm Date l3.782.4.96.6

Longines HydroConquest Automatic 43mm Date l3.782.4.96.6

Longines - L37824-966 · $960
A Longines HydroConquest 43mm Automatic in blue with ceramic, unidirectional rotating bezel, a solid stainless steel case, and water resistance up to 300 meters.

  • Condition: Excellent, used maybe 5 times since new
  • Case size: 43mm diameter
  • Depth rating: 300m
Posted at
Nov 30, 2025, 12:17 PM
Active
[WTS] Longines Hydroconquest 41mm Sunray Grey Ref L3.782.4.76.6 Full Kit plus extra strap $950

Longines Hydroconquest 41mm Sunray Grey Ref L3.782.4.76.6 Full Kit plus extra strap $950

The Longines HydroConquest features a stunning sunray grey dial that shifts beautifully under light, giving it a sleek, modern look that works equally well dressed up or down. The watch wears comfortably at 41mm and the proportions make it a great everyday piece that still feels special on the wrist.

  • Condition: Great shape overall, with only light surface wear on the case and bracelet
  • Case size: 41mm diameter
  • Lug to lug length: 51mm
  • Thickness: 11.9mm
Posted at
Nov 29, 2025, 11:32 AM
Active
Longines HydroConquest, L3.781.4.06.9, Steel Diver, Olive, Excellent Condition.

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