The Longines HydroConquest 39mm Automatic [L3.779.4.56.6] is proof that a true luxury dive watch doesn't need to sacrifice refinement for capability. Combining Swiss watchmaking heritage with modern engineering, it delivers professional 300-metre water resistance, exceptional everyday comfort, and timeless styling in one of the most versatile case sizes available.

Whether you're heading into the office, travelling abroad, or spending a weekend on the water, the HydroConquest 39 mm is equally at home beneath a tailored cuff or paired with casual attire. Powered by Longines' advanced Calibre L888.5automatic movement with a silicon balance spring and impressive 72-hour power reserve, it offers the reliability and precision today's discerning collector expects. 

Key Highlights

✓ Swiss Made Automatic Dive Watch

✓ Longines Calibre L888.5 Automatic Movement

✓ 72-Hour Power Reserve

✓ Silicon Balance Spring for Enhanced Magnetic Resistance

✓ 39 mm Stainless Steel Case

✓ Black Lacquered Polished Dial

✓ Unidirectional Black Ceramic Dive Bezel

✓ Double Anti-Reflective Sapphire Crystal

✓ 300 Metres (30 Bar) Water Resistance

✓ Screw-In Crown & Screw-Down Case Back

✓ Stainless Steel Bracelet with On-the-Fly Micro-Adjustment

✓ 5-Year Longines International Warranty

✓ Free Shipping Across Canada

Why You'll Love This Watch

The 39 mm HydroConquest has quickly become one of the most sought-after modern dive watches because it strikes an ideal balance between sportiness and elegance. It wears comfortably on a wide variety of wrist sizes while maintaining the presence expected of a professional diving watch.

Longines has elevated this latest generation with meaningful technical upgrades, including a scratch-resistant ceramic bezel, a silicon balance spring for greater resistance to magnetism, a robust 72-hour power reserve, and a refined bracelet featuring an integrated micro-adjustment clasp. These improvements transform the HydroConquest into an outstanding everyday luxury watch that's built to perform for decades.

A Modern Swiss Dive Watch Built for Every Occasion

From its polished black lacquered dial to its beautifully finished stainless steel case, every detail of the HydroConquest reflects Longines' commitment to functional elegance. Bright Super-LumiNova® hands and applied hour markers provide exceptional legibility in low light, while the ceramic bezel offers excellent scratch resistance and long-term durability.

Engineered to withstand demanding environments, the HydroConquest features a screw-in crown, screw-down case back, double anti-reflective sapphire crystal, and 300 metres of water resistance, making it equally capable for recreational diving, swimming, travel, and daily wear. 

At the heart of the watch beats the Longines Calibre L888.5, a self-winding mechanical movement developed exclusively for the brand. Operating at 25,200 vibrations per hour, it delivers an extended 72-hour power reserve, while its monocrystalline silicon balance spring significantly improves resistance to magnetic fields, temperature variation, and everyday shocks for enhanced long-term accuracy. 

Completing the watch is a beautifully finished stainless steel H-link bracelet equipped with a double-security folding clasp and integrated micro-adjustment system, allowing effortless comfort throughout the day without compromising the clean, elegant profile of the watch.

How It Compares

If you're considering luxury Swiss dive watches such as the Tudor Black Bay 58, Omega Seamaster Diver 300M, Oris Aquis Date, or Mido Ocean Star, the Longines HydroConquest stands out by combining exceptional finishing, modern movement technology, and everyday versatility at an outstanding value. Its compact 39 mm proportions make it especially appealing for collectors seeking a contemporary dive watch that remains elegant enough for daily wear.

Perfect For

• Everyday luxury wear
• Business professionals
• Weekend adventures
• International travel
• Recreational diving
• First luxury Swiss watch
• Anniversary gifts
• Graduation gifts
• Retirement gifts
• Watch enthusiasts seeking exceptional value

Technical Specifications

• Brand: Longines
• Collection: HydroConquest
• Reference Number: L3.779.4.56.6
• Case Diameter: 39 mm
• Case Material: Stainless Steel
• Bezel: Black Ceramic Unidirectional Rotating Bezel
• Dial: Black Lacquered Polished
• Movement: Longines Calibre L888.5 Automatic
• Power Reserve: Approximately 72 Hours
• Balance Spring: Monocrystalline Silicon
• Functions: Hours, Minutes, Seconds, Date
• Crystal: Scratch-Resistant Sapphire Crystal with Double Anti-Reflective Coating
• Water Resistance: 300 Metres (30 Bar)
• Crown: Screw-In
• Case Back: Screw-Down
• Bracelet: Stainless Steel H-Link Bracelet
• Clasp: Double Security Folding Clasp with Micro-Adjustment

Why Buy Your Longines from Mani Jewellers?

When you purchase your Longines HydroConquest from Mani Jewellers, you're buying from an Authorized Canadian Longines Dealer with decades of experience helping collectors find the perfect timepiece.

Every watch includes:

• Genuine 5-Year Longines International Warranty
• Complimentary Bracelet Sizing
• Fully Insured Shipping Across Canada
• Authentic Longines Presentation Box & Documentation
• Dedicated After-Sales Support from Our Experienced Team

Whether you're purchasing your first Swiss timepiece or adding to an established collection, we're committed to providing the confidence and service that should accompany every luxury watch purchase.

Authorized Longines Dealer | 5-Year Longines International Warranty | Complimentary Bracelet Sizing | Free Shipping Across Canada