Longines HydroConquest Hydroconquest Automatic 42 Stainless Steel / Frosted Blue / Bracelet
Reference L3.788.4.98.6
About this watch
The Longines HydroConquest L3.788.4.98.6 debuted in 2026 as part of the HydroConquest collection, Longines’ line of contemporary dive watches designed for professional water resistance and everyday durability. The model follows the design direction introduced with the HydroConquest GMT in 2024, which revised the collection’s dial layout and finishing. The round stainless steel case measures 42 mm in diameter and is equipped with a screw-in crown and a unidirectional rotating bezel fitted with a ceramic insert. Water resistance is rated to 30 bar. The watch is fitted with a scratch-resistant sapphire crystal with several layers of anti-reflective coating applied to both sides.
The dial is executed in frosted blue with a sunray finish. Applied indexes serve as hour markers, reflecting the updated HydroConquest design that no longer features Arabic numerals on the dial. Silvered polished hands indicate the time, while a date display completes the functional layout.
Power is provided by the Longines calibre L888, a self-winding mechanical movement beating at 25,200 vibrations per hour. The movement is equipped with a monocrystalline silicon balance spring and offers a power reserve of approximately 72 hours. It drives the central hours, minutes, and seconds together with the date indication.
The L3.788.4.98.6 is fitted with a stainless steel bracelet secured by a double security folding clasp with a micro-adjustment system.
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Specifications
- Brand
- Longines
- Family
- HydroConquest
- Model
- Hydroconquest Automatic 42 Stainless Steel / Frosted Blue / Bracelet
- Reference
- L3.788.4.98.6
- Movement
- l888-2
- Movement Features
-
- Hours, Minutes, Seconds
- Date
- Case
- 42mm
- Dial Color
- Blue
- Crystal
- Sapphire
- Water Resistance
- 300
Current Listings
![[WTS] Longines HydroConquest 41 -$950](https://preview.redd.it/sman7rm7zztg1.jpg?width=640&crop=smart&auto=webp&s=8831270588ed3e11ae91df0225f5cfa98c315e26)
Longines HydroConquest 41 -$950
This Longines HydroConquest 41 is a water-resistant watch with a clean bezel and crystal, but shows signs of wear on the case and bracelet.
- Condition: Very Good Pre-owned Condition
- Case size: 41mm
- Bezel condition: Clean - slightly misaligned
- Bracelet wear: Hairline wear on polished links, one link has deep scratches
![[WTS] Longines HydroConquest 2 tone Green Dial 2024 $1320](https://preview.redd.it/2q666j08urtg1.jpg?width=640&crop=smart&auto=webp&s=2afd196e0b80c65f8d012c7ba5c2d5bfc0fb2a95)
Longines HydroConquest 2 tone Green Dial 2024 $1320
- Image: https://imgur.com/a/bPjxHRP
![[WTS] Longines Hydroconquest GMT 41mm](https://preview.redd.it/kx2si05scusg1.jpg?width=640&crop=smart&auto=webp&s=6f674e4340659513d22861adaa4e6f7e21f42f56)
Longines Hydroconquest GMT 41mm
Beautiful Longines Hydroconquest GMT with a 41mm case, included in the sale are extra links, warranty card, and original packaging.
- Condition: very good condition
- Water Resistance: not specified
- Warranty Years: 2
![[WTS] Longines Hydroconquest Green Dial Black Bezel](https://preview.redd.it/t5iimvsb3lsg1.jpg?width=640&crop=smart&auto=webp&s=0e0528c0c91782e685844db3df4e1ec370556a84)
Longines Hydroconquest Green Dial Black Bezel
- Condition: Perfect
- Year Of Purchase: August 2025
- Crown And Buckle Straps: 2 additional
- Shipping Info: US only
![[WTS] Longines Hydroconquest GMT - 41mm - Sunray Brown - Box and Papers - Excellent Condition](https://preview.redd.it/qivmazym0fsg1.jpg?width=640&crop=smart&auto=webp&s=4e49902d3641aa922643e2690a7207ece9b7d528)
Longines Hydroconquest GMT - 41mm - Sunray Brown - Box and Papers - Excellent Condition
The Longines Hydroconquest GMT features a 41mm stainless steel case, a true GMT movement, and a brown sunray dial with a brown ceramic bezel insert. It has a quick-adjust bracelet and a sapphire crystal with anti-reflective coating.
- Condition: Excellent, some minor hairline scratches on the bracelet
- Case size: 41mm
- Lug width: 21mm
- Thickness: 12.8mm
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