Longines HydroConquest Chronograph Ref. L3.650.4.16.6
Dive Watch / Chronograph · Longines (Swatch Group), luxury tier, renowned for historical elegance, aviation achievements, and robust sports watches
Period: Modern Luxury (2000s-present)
Type
Dive Watch / Chronograph
Brand
Longines (Swatch Group), luxury tier, renowned for historical elegance, aviation achievements, and robust sports watches
Movement
Automatic mechanical chronograph, ETA 7750 / Longines Cal. L688 or equivalent base, 28,800 vph (4Hz), approximately 48 hours power reserve, 25 or 27 jewels
Dimensions
Case diameter: 41mm, Case thickness: ~15mm, Lug-to-lug: ~50mm, Lug width: 21mm
Description
This Longines HydroConquest Chronograph combines robust dive-watch architecture with precise chronograph functionality. Featuring a striking white dial and a distinctive steel bezel, it delivers exceptional legibility, rugged sports styling, and daily wearability. As part of Longines' popular sports line, it bridges the gap between a professional tool watch and a sophisticated luxury timepiece.
Key Features
Distinctive raised bezel numerals, bold Arabic numeral 12, robust chronograph sub-dial layout, screw-down crown for water resistance, and the classic Longines sporty aesthetic
Dial Description
White dial with a triple-register chronograph layout, Arabic numeral 12 and applied luminous markers, skeletonized or sword hands with luminous inserts, date window neatly angled between 4 and 5 o'clock
Case Material
Stainless steel (316L) with combination polished and satin-brushed finishing
Crystal Type
Scratch-resistant sapphire crystal with anti-reflective coating
Bezel Details
Unidirectional rotating stainless steel dive bezel with raised numerals and minute markers
Crown & Pushers
Screw-down crown with crown guards and branded logo, flanked by standard pump-style chronograph pushers
Bracelet or Strap
Stainless steel multi-link bracelet with folding clasp and diving extension
Caseback Details
Solid screw-down stainless steel caseback featuring the classic Longines winged hourglass engraving
Movement Type
Automatic mechanical chronograph, ETA 7750 / Longines Cal. L688 or equivalent base, 28,800 vph (4Hz), approximately 48 hours power reserve, 25 or 27 jewels
Water Resistance
Rated to 300 meters (1000 feet / 30 ATM), suitable for professional marine activity, skin diving, and high-impact water sports
Origin & Provenance
Swiss Made, manufactured in Saint-Imier, Switzerland, utilizing Swiss movements
Age Estimate
Circa 2010s production based on the first-generation HydroConquest chronograph design
Cultural Significance
Represents the accessible luxury segment of Swiss watchmaking, offering robust everyday sports watches with historical backing from a brand that predates many major contemporary watchmakers
Condition Notes
Appears in very good pre-owned condition with minor surface wear consistent with careful use on the case and bracelet, crystal and dial appear pristine
Value Estimate
Secondary market value typically ranges from $1,200 to $1,800 USD depending on the inclusion of original box, papers, and overall condition
Care & Maintenance
Recommended full mechanical service every 4 to 5 years, water resistance pressure testing annually if used for swimming, and cleaning the steel bracelet with mild soap and warm water
Similar Watches
Tag Heuer Aquaracer Chronograph, Omega Seamaster Diver 300M Chronograph, Oris Aquis Chronograph
Interesting Facts
The HydroConquest line was introduced to provide high-performance diving instrumentation paired with Longines' rich heritage in sports timekeeping, quickly becoming one of the brand's best-selling modern collections