Longines HydroConquest Hydroconquest Chronograph
Reference L3.644.4.96.6
About this watch
The Longines HydroConquest Chronograph, reference L3.644.4.96.6, is a stunning piece that combines sophisticated style with rugged durability. This timepiece boasts an array of impressive specifications that are sure to turn heads. At first glance, the Hydroconquest Chronograph captivates with its striking blue dial, reminiscent of the deep sea, evoking a sense of adventure. The mixed indexes and proprietary hands provide a unique touch, further enhancing its allure. Each element of the design has been meticulously crafted to ensure not just beauty but also functionality. The robust stainless steel case adds to its durability while giving it a sophisticated look. The rotating bezel is designed for divers, allowing you to track elapsed time underwater. With a diameter of 41.00 mm, this watch sits comfortably on the wrist without feeling bulky. At the core of this masterpiece is the esteemed ETA caliber 7750, renowned for its reliability and precision. This automatic movement features a frequency of 28,800 vibrations per hour and boasts 25 jewels, ensuring smooth operation. The chronograph function is a standout feature, with separate sub-dials for seconds, minutes, and hours, making timing events a breeze. With an impressive water resistance of 300 meters, the Hydroconquest Chronograph is perfect for diving enthusiasts. Its sapphire crystal and stainless steel bracelet ensure durability and style, respectively. This watch is not just a timepiece but an investment in quality and style.
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Key Features
- Automatic ETA caliber 7750 movement
- Stainless steel case with rotating bezel
- Sapphire crystal for scratch-resistance
- 300m water resistance
- Chronograph function with separate sub-dials
- 41.00mm diameter and comfortable fit
- Durable stainless steel bracelet
Specifications
- Brand
- Longines
- Family
- HydroConquest
- Model
- Hydroconquest Chronograph
- Reference
- L3.644.4.96.6
- Movement
- 7750
- Movement Features
-
- Hours, Minutes, Small Seconds
- Date, Day
- Chronograph
- Case
- Stainless Steel 41mm
- Dial Color
- Blue
- Crystal
- Sapphire
- Water Resistance
- 300
Current Listings
![[WTS] NEW RELEASE 2026 Longines HydroConquest L37794566 Full Set $2,000](https://preview.redd.it/anspmxhl16xg1.jpg?width=640&crop=smart&auto=webp&s=453ef0920a5f2020ec541b48bd4da0fcda7f2e57)
NEW RELEASE 2026 Longines HydroConquest L37794566 Full Set $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
![[WTS] New Longines HydroConquest 42mm](https://preview.redd.it/4tbw7x88txwg1.jpg?width=640&crop=smart&auto=webp&s=c68839911e49be8b515c2d7924578d4d0c1d9987)
New Longines HydroConquest 42mm
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
![[WTS] Longines Hydroconquest Chronograph 41 Ref. L3.783.4 – Travel Box & Manual | $1,850](https://preview.redd.it/tol5a6cznswg1.jpg?width=640&crop=smart&auto=webp&s=7ad74ad9fa0ac8cf212bf09a7327a6f1f42c55d1)
Longines Hydroconquest Chronograph 41 Ref. L3.783.4 – Travel Box & Manual | $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)
![[WTS] Longines HydroConquest GMT 41mm Black, Full Kit, June 2025](https://preview.redd.it/c4c7iqv7e9wg1.jpg?width=640&crop=smart&auto=webp&s=e250849b5d9c5e65f6e77a3d09a1db59c45552a5)
Longines HydroConquest GMT 41mm Black, Full Kit, June 2025
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
![[WTS] Longines Hydroconquest 39mm Black MINT](https://preview.redd.it/v4pffvhrc5wg1.jpeg?auto=webp&s=814fab44f946ceacdedaffaa381634bee5d33c82)
Longines Hydroconquest 39mm Black MINT
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
![[WTS] Longines HydroConquest 39mm Green Ceramic Bezel 2026 NEW L3.779.4.06.6 – $2800 + shipping](https://preview.redd.it/aoihsdkp4qvg1.jpg?width=640&crop=smart&auto=webp&s=afddea4ac8c74bd6c345aacb7c77a1c4f9e694fc)
Longines HydroConquest 39mm Green Ceramic Bezel 2026 NEW L3.779.4.06.6 – $2800 + shipping
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
![[WTS] 2026 Longines Hydroconquest 39mm - Grey Bezel / Black Dial](https://preview.redd.it/1iats6ttplvg1.jpeg?auto=webp&s=a3e1b3b3cb0efcf818e0cc8de77f1c55f05751aa)
2026 Longines Hydroconquest 39mm - Grey Bezel / Black Dial
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
![[WTS] Longines HydroConquest Sunray Blue- L3.790.4.96.6](https://preview.redd.it/c9ai1o14ukvg1.jpg?width=640&crop=smart&auto=webp&s=19e13d80129d3c19dcadec2001aa99aec7c23fc0)
Longines HydroConquest Sunray Blue- L3.790.4.96.6
A brand new Longines HydroConquest with sunray blue dial, featuring a new box and papers.
- Condition: Brand new
- Box And Papers: brand new
![[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](https://preview.redd.it/uak0p5i0mkvg1.jpg?width=640&crop=smart&auto=webp&s=8674480795a645eee12b4e5f612f85a6f1aa1aad)
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
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