Longines HydroConquest HydroConquest 39 Automatic Stainless Steel / Black / Rubber
Reference L3.780.4.56.9
About this watch
The Longines HydroConquest 39 Automatic is a remarkable watch that beautifully marries style and functionality. From its robust design to its precise movement, it’s a watch that not only tells time but also tells a story—your story. With a striking design and robust functionality, this watch is a true contender in the realm of diving timepieces. The HydroConquest boasts a chronometer certification, ensuring accuracy and precision in its timekeeping. Wearing a watch should feel like a second skin, and the HydroConquest excels in this department with its comfortable fit and adjustable rubber strap. It’s suitable for professional diving activities and offers a contemporary twist on classic diving aesthetics. The Longines caliber L888.5 movement features a silicon balance spring, enhancing precision and reliability.
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Key Features
- Stainless Steel Case
- 300m Water Resistance
- Chronometer Certification
- Longines Caliber L888.5 Movement
- Silicon Balance Spring
- Adjustable Rubber Strap
- 39mm Diameter
Specifications
- Brand
- Longines
- Family
- HydroConquest
- Model
- HydroConquest 39 Automatic Stainless Steel / Black / Rubber
- Reference
- L3.780.4.56.9
- Movement
- l888-5
- Movement Features
-
- Hours, Minutes, Seconds
- Date
- Chronometer
- Case
- 39mm
- Dial Color
- Black
- Crystal
- Sapphire
- Water Resistance
- 300
Current Listings
![[WTS] 2025 Longines Hydroconquest 41mm Ref: L37814056](https://preview.redd.it/ya49a4pp1mzg1.jpg?width=640&crop=smart&auto=webp&s=cb113d6816c7a2fe45079651eea6800af76c44d8)
2025 Longines Hydroconquest 41mm Ref: L37814056
This listing is for a 2025 Longines Hydroconquest 41mm watch, featuring an automatic self-winding caliber L888.5, unidirectional green ceramic bezel, and 300M water resistance.
- Condition: Like new with some minor marks on the bracelet and buckle
- Case size: 41mm
- Bracelet type: Stainless steel
- Water resistance: 300m depth rating
![[WTS] Longines Hydroconquest 42 mm “Green” 2026](https://preview.redd.it/hm9dwcf6qlzg1.jpg?width=640&crop=smart&auto=webp&s=1980c64f607b394182742d8f0b65514a62f73a2a)
Longines Hydroconquest 42 mm “Green” 2026
Up for sale is one of my new Longines Hydroconquest 42mm watches, I purchased several but find myself gravitating towards other models.
- Condition: New
- Case size: 42mm diameter
![[WTS] (Longines) (2026 Hydroconquest 39mm Commonwealth) Brand New and Unworn](https://preview.redd.it/fsb6xre45lzg1.jpg?width=640&crop=smart&auto=webp&s=a209b82914969f35eb9b0ccefdfa7e6763495a5f)
(Longines) (2026 Hydroconquest 39mm Commonwealth) Brand New and Unworn
This is a Limited Edition Hydroconquest Commonwealth Games watch from Longines, purchased brand new from an authorized dealer and still under warranty.
- Case diameter: 39mm
- Box condition: great condition with exception of price sticker on outer box
![[WTS] Longines HydroConquest 39mm Black Dial – 2026 Model, Worn Once. $1,995](https://preview.redd.it/ihyzvffwa5zg1.png?width=640&crop=smart&auto=webp&s=0aaa89e4a10141e5b2cb16432d533ac6562ca820)
Longines HydroConquest 39mm Black Dial – 2026 Model, Worn Once. $1,995
A Longines HydroConquest with a black dial and steel bracelet for sale. It's the latest iteration from 2026, purchased recently but only worn once to a wedding.
- Condition: Near mint, worn once
- Case size: 39mm
- Movement: Automatic
![[WTS] New Longines HydroConquest 42mm Frosted Blue Dial](https://preview.redd.it/dchzi1zvhyyg1.jpg?width=640&crop=smart&auto=webp&s=4acb97adce81fab67340b57de2dcad24b72c4898)
New Longines HydroConquest 42mm Frosted Blue Dial
A brand new Longines HydroConquest with a frosted blue dial in 42mm size.
- Condition: new
- Case size: 42mm
- Diameter: 42mm
![[WTS] Longines HydroConquest GMT Blue Ref: L3.790.4.96.6 (2026). New/Complete. $1,999](https://preview.redd.it/24f0tlqxbmyg1.jpg?width=640&crop=smart&auto=webp&s=05634fa81272e703de563acc5e0cf7d5e94065b7)
Longines HydroConquest GMT Blue Ref: L3.790.4.96.6 (2026). New/Complete. $1,999
The Longines HydroConquest GMT Blue is a true GMT diver with a sunray blue dial, blue ceramic bezel, and Calibre L844.5 automatic movement.
- Condition: Brand New
- Case diameter: 41mm
- Water resistance: 300m
- Movement type: Calibre L844.5 automatic
![[WTS] New Longines Hydroconquest 42mm Frosted Blue Dial](https://preview.redd.it/p91j2kpsejyg1.jpeg?auto=webp&s=9ac016ff9120a01f02fa1458897abd9878e27d5e)
New Longines Hydroconquest 42mm Frosted Blue Dial
A brand new Longines Hydroconquest 42mm with a frosted blue dial, sold exclusively at Corporate boutiques. The watch comes with all links, papers, and box.
- Condition: Brand new
- Diameter: 42mm
![[WTS] 2026 Longines HydroConquest L37884906 42 mm Black Dial Blue Bezel Full Set $1,900](https://preview.redd.it/ct5ldusrpfyg1.jpg?width=640&crop=smart&auto=webp&s=6b13d5c447ea4486f055edabe339d2d9df46e3f0)
2026 Longines HydroConquest L37884906 42 mm Black Dial Blue Bezel Full Set $1,900
The Longines HydroConquest L37884906 features a black dial and blue ceramic bezel, with an automatic movement providing reliable performance. The watch has a robust build, unidirectional dive bezel, and strong water resistance, making it a capable tool watch while maintaining a refined aesthetic.
- Condition: Excellent (pre-owned, minimal wear)
- Year: 2026
- Case size: 42mm diameter
- Case material: Stainless steel
Longines HydroConquest, L3.781.4.06.9, Steel Diver, Olive, Excellent Condition.
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