Longines HydroConquest Frosted Blue Sunray Dial Men 42mm L37884996

Blending high-performance deep-sea aquatic architecture with an exclusive frosted dial treatment and modern Swiss mechanical precision, the Longines HydroConquest 42mm  L37884996 delivers a bold, contemporary statement in luxury diver wristwear. Sculpted in an authoritative 42.00 mm surgical-grade 316L stainless steel case measuring a streamlined 11.90 mm in thickness with a 51.00 mm lug-to-lug span, this model pairs vertical satin-brushed surfaces with mirror-polished case flanks and an ultra-hard, scratch-proof blue ceramic unidirectional rotating dive bezel. The dial showcases an eye-catching frosted blue sunray finish that diffuses ambient glare while reflecting shimmering aquatic tones, framed by applied Arabic numerals, circular indices, and rhodium-plated hands treated with Swiss Super-LumiNova® alongside an integrated date window at 3 o'clock beneath a scratch-resistant sapphire crystal with multi-layer anti-reflective coating on both sides. Powered by Longines' exclusive in-house Calibre L888 mechanical automatic movement, it features an antimagnetic monocrystalline silicon balance-spring, beats at 25,200 vibrations per hour (3.5 Hz), and delivers a weekend-proof 72-hour power reserve. Mounted on an articulated solid stainless steel link bracelet secured by a double-security folding clasp with an integrated micro-adjustment system, it is pressure-tested for a professional 300 metres (30 bar / 1,000 feet) of water resistance and protected by an official 5-year Longines international warranty.

Key Highlights

• Exclusive Frosted Blue Sunray Dial: Specialized frosted radial texture that scatters incoming ambient light across glacial azure, cyan, and deep royal blue shades.

• High-Tech Blue Ceramic Dive Bezel: Scratch-proof, fade-resistant polished blue ceramic insert with an engraved 60-minute elapsed-time scale and a luminescent Super-LumiNova® marker at 12 o'clock.

• Exclusive Longines Calibre L888 Automatic: Proprietary Swiss mechanical movement operating at 25,200 vibrations per hour (3.5 Hz) with an extended 72-hour power reserve.

• Antimagnetic Silicon Balance-Spring: Monocrystalline silicon hairspring delivering high resistance to magnetic fields and superior long-term chronometric stability.

• Professional 300-Metre Water Resistance: Tested to 30 bar (300 m / 1,000 ft) with a screw-down crown, protective shoulders, and a solid screw-down steel case back.

• Streamlined 11.90mm Case Thickness: Ergonomic low-profile sports-diver case architecture engineered to slide comfortably beneath jacket cuffs.

• Integrated 3 O'Clock Date Aperture: Convenient quickset calendar window positioned cleanly at 3 o'clock for effortless daily scheduling.

• High-Intensity Swiss Super-LumiNova®: Generously coated across oversized Arabic numerals (6, 9, 12), geometric hour indices, and the broad handset for legibility in deep water.

• Multi-Layer Anti-Reflective Sapphire Crystal: Premium scratch-resistant sapphire crystal treated with multiple anti-reflective coatings on both sides for glare-free readability.

• Solid Stainless Steel Link Bracelet: Robust three-link metal bracelet featuring brushed outer links and polished center segments for a supple wrist drape.

• Double-Security Clasp with Micro-Adjustment: Ergonomic folding deployant buckle featuring dual push-button safety and an integrated fine micro-adjustment system.

• Official 5-Year Longines International Warranty: Backed worldwide by Longines' 5-year guarantee provided for timepieces equipped with silicon balance technology.

Design & Craftsmanship

Deep-Sea Maritime Architecture & The 42mm Stainless Steel Case

The HydroConquest collection represents Longines’ flagship modern aquatic line, engineered to meet the demanding requirements of professional offshore divers while retaining the tailored refinement of Saint-Imier watchmaking. Measuring an assertive 42.00 mm in diameter with a thickness of 11.90 mm and a 51.00 mm lug-to-lug span, reference L3.788.4.99.6 presents an imposing, purposeful silhouette. Forged from surgical-grade 316L stainless steel, the chassis combines vertical satin-brushed lug tops with mirror-polished flanks. The unidirectional rotating dive bezel is fitted with an ultra-hard blue ceramic insert that is virtually scratch-proof and impervious to salt water and UV radiation. Flanked by sculpted crown guards, the fluted screw-down crown ensures complete water tightness to 300 metres while providing a tactile grip during underwater timing.

Frosted Blue Sunray Dial Depth, Ceramic Bezel & Super-LumiNova® Legibility

The dial architecture prioritizes immediate, at-a-glance underwater legibility and distinctive texture. Departing from traditional high-gloss dials, this reference introduces an exclusive frosted blue sunray dial face. The fine, crystalline grain diffuses reflections while catching shifting ambient light across icy cerulean, arctic azure, and deep oceanic cobalt tones. The dial layout combines applied circular indices with oversized applied Arabic numerals at 6, 9, and 12 o'clock, complemented by broad rhodium-plated hands and a snowflake/diamond-tipped running seconds hand. All markers and hands are generously coated with high-performance Swiss Super-LumiNova® to emit an intense green glow in pitch-dark environments. A quickset date aperture sits at 3 o'clock, shielded by a scratch-resistant sapphire crystal with multi-layer anti-reflective coating on both faces.

Exclusive Calibre L888 Automatic Engineering & Micro-Adjusting Steel Bracelet

Operating beneath the solid screw-down case back—embossed with the historic Longines winged hourglass emblem—beats the exclusive in-house Calibre L888 (ETA A31.L11 base). Operating at an optimized frequency of 25,200 vibrations per hour (3.5 Hz) with 21 synthetic ruby jewels, this mechanical self-winding movement is fitted with an antimagnetic monocrystalline silicon balance-spring. Silicon is completely impervious to electromagnetic fields encountered in daily life (laptops, mobile phones, tablet cases, and scanners) while offering superior thermal stability, allowing the movement to maintain unwavering chronometric accuracy across its 72-hour power reserve. The watch is paired with a solid 316L stainless steel three-link bracelet featuring an advanced double-security folding clasp equipped with an integrated micro-adjustment system, allowing the wearer to fine-tune bracelet tension as the wrist naturally swells or contracts.