The Longines HydroConquest L3.788.4.90.6 represents the modern dive watch at its most refined and confident — a 42 mm Swiss automatic timepiece that brings together serious diving credentials, sleek contemporary design, and the iconic versatility that has made the HydroConquest one of the most popular collections in Longines history. Part of the newly redesigned 2026 generation, this reference is the definitive choice for those who want a dive watch that performs in the water and looks just as natural under a shirt cuff.

The 42 mm stainless steel case is paired with a unidirectional rotating bezel featuring a black ceramic insert — scratch-resistant, high-contrast, and built to last. A scratch-resistant sapphire crystal with multiple layers of anti-reflective coating on both sides ensures crystal-clear legibility from any angle, while the screw-in crown and screw-down case back guarantee water resistance to an impressive 30 bar (300 metres).

The black lacquered polished dial delivers the timeless tool-watch aesthetic — clean, legible, and coated with Swiss Super-LumiNova® on the applied indexes and hands for outstanding visibility in low-light and underwater conditions. A date function sits at the 3 o'clock position for everyday practicality.

At the heart of the watch beats an exclusive Longines automatic calibre operating at 25,200 vibrations per hour, equipped with a monocrystalline silicon balance spring for outstanding anti-magnetic performance — and offering an impressive 72-hour power reserve. The polished stainless steel bracelet is fitted with a double security folding clasp featuring a micro-adjustment system, ensuring a perfect fit at every wrist size and condition.