The Longines HydroConquest L3.781.4.05.6 combines technical excellence with modern sports performance. Housed in a 41.00 mm stainless steel case with a ceramic bezel, it features a striking black dial with Swiss Super-LumiNova for optimal legibility.

Powered by a self-winding mechanical movement beating at 25,200 vibrations per hour, this automatic watch delivers a reliable power reserve of up to 72 hours alongside a convenient date display.

Built for aquatic exploration, it offers 30 bar water resistance, a screw-in crown, a unidirectional rotating bezel, and a durable stainless steel bracelet with a double safety folding clasp.

Key Features

Brand	Longines
Collection	HydroConquest
Model Number	L3.781.4.05.6
Movement Type	Automatic (Self-winding mechanical)
Power Reserve	72 hours
Frequency	25,200 vph
Case Diameter	41 mm
Case Material	Stainless steel and ceramic bezel
Bezel	Unidirectional rotating bezel
Crown	Screw-in crown
Crystal	Scratch-resistant sapphire crystal with anti-reflective coating on both sides
Water Resistance	30 bar (300 m)
Dial Color	Black
Luminescence	Swiss Super-LumiNova
Functions	Date, hours, minutes, seconds
Bracelet Material	Stainless steel
Clasp Type	Double safety folding clasp

Highlights

Swiss automatic self-winding movement with up to 72 hours of power reserve
Durable stainless steel 41 mm case with a scratch-resistant black ceramic bezel
Scratch-resistant sapphire crystal with anti-reflective coating on both sides
Water-resistant up to 30 bar (300 m) with a secure screw-in crown
Black dial with high-contrast Swiss Super-LumiNova luminescence and date display
Stainless steel bracelet equipped with a double safety folding clasp

Frequently asked questions

What is the case diameter of the Longines HydroConquest L3.781.4.05.6?

The case measures 41.00 mm in diameter.

What type of movement powers this watch?

It is powered by a self-winding mechanical automatic movement with a power reserve of up to 72 hours.

What is the water resistance rating for this model?

This watch features a water resistance rating of 30 bar (300 meters) supported by a screw-in crown.

What materials are used for the case and bezel?

The watch features a stainless steel case paired with a scratch-resistant ceramic unidirectional rotating bezel.

What type of crystal protects the dial?

It is fitted with a scratch-resistant sapphire crystal featuring multiple layers of anti-reflective coating on both sides.

What style of clasp is on the bracelet?

The stainless steel bracelet is secured with a double safety folding clasp.

Longines HydroConquest Automatic Watch L3.781.4.05.6