Longines HydroConquest HydroConquest 39 Automatic Stainless Steel / Blue / Rubber

Reference L3.780.4.96.9

Longines HydroConquest 39 Automatic Stainless Steel / Blue / Rubber

About this watch

The Longines HydroConquest 39 Automatic is a masterpiece of modern watchmaking that exudes luxury and sophistication. With its stunning blue dial, matte finish, and rotating bezel, this timepiece is a true showstopper. The Longines caliber L888.5 self-winding movement features a silicon balance spring, ensuring accuracy and longevity. Certified as a chronometer, this watch has passed rigorous tests for precision, making it a serious contender in the diving watch category. With its 300-meter water resistance rating, durable rubber strap, and sapphire crystal, this watch is built to withstand the rigors of underwater adventures while maintaining a chic appearance for everyday wear.
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Key Features

  • 39mm stainless steel case
  • Longines caliber L888.5 self-winding movement
  • Silicon balance spring for accuracy and longevity
  • 300-meter water resistance rating
  • Sapphire crystal for superior clarity and protection
  • Durable rubber strap with 19mm lug width
  • Certified chronometer for precision

Specifications

Brand
Longines
Family
HydroConquest
Model
HydroConquest 39 Automatic Stainless Steel / Blue / Rubber
Reference
L3.780.4.96.9
Movement
l888-5
Movement Features
  • Hours, Minutes, Seconds
  • Date
  • Chronometer
Case
39mm
Dial Color
Blue
Crystal
Sapphire
Water Resistance
300

Current Listings

[WTS] Longines Hydroconquest Chronograph 41 Ref. L3.783.4 – Travel Box & Manual | $1,900

Longines Hydroconquest Chronograph 41 Ref. L3.783.4 – Travel Box & Manual | $1,900

Longines - L3.783.4 · $1,900
This Longines Hydroconquest Chronograph is a high-performance Swiss diver's watch featuring a blue ceramic bezel and screw-down crown, powered by the calibre L688.2 column-wheel chronograph movement with a 54-hour power reserve.

  • Condition: Very good with minor usage marks
  • Case Size: 41mm x 51mm stainless steel case, 15.6mm thickness, 21mm lug width
  • Movement: Longines L688.2 automatic column wheel chronograph with 27 jewels, 28,800 bph, and a 54-hour power reserve
  • Water Resistance: 300m (30 ATM)
Posted at
Apr 15, 2026, 11:30 AM
Active
View listing on r/WatchExchange
[WTS] Longines HydroConquest GMT Black. Ref: L3.790.4.56.6 (2025) Complete. $1,950

Longines HydroConquest GMT Black. Ref: L3.790.4.56.6 (2025) Complete. $1,950

Longines - L3.790.4.56.6 · $1,950
This Longines HydroConquest GMT Black is a modern dive watch with excellent everyday wearability, offering both tool watch functionality and travel convenience.

  • Condition: Excellent pre-owned
  • Case size: 41mm diameter
  • Water resistance: 300m
Posted at
Apr 14, 2026, 9:45 PM
Active
View listing on r/WatchExchange
[WTS] (Longines) (2026 Hydroconquest 42) Full 5 Year Warranty, LNIB

(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
Active
View listing on r/WatchExchange
[WTS] Longines Hydroconquest 43mm Full Black Ceramic Ref L3.784.4.56.9 MINT Full Kit $2500

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
Active
View listing on r/WatchExchange
[WTS] Longines Hydroconquest GMT | 41mm | Sunburst Brown | Excellent Condition

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
Active
View listing on r/WatchExchange
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
View listing on RolexForums