The Longines HydroConquest 39mm is a steel dive watch with a ceramic bezel, 300 m water resistance and a blue lacquered dial. Its silicon balance-spring movement runs at 25,200 vph with up to 72 hours of power reserve, which is generous for the class. At 39 mm it wears smaller than most dive watches, so it suits wrists that find 41–43 mm cases bulky. Against rivals like the Tudor Black Bay 58 and Oris Aquis, it offers ceramic, sapphire and a silicon escapement at a lower tier of the market, though its clasp and finishing are a step behind the premium names.
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Owners rate the HydroConquest as a solid value dive watch, praising the compact 39 mm case, the ceramic bezel and the long power reserve. Common complaints are the bracelet's modest finishing and a bezel that feels stiff compared with more expensive divers.
The Longines Hydroconquest L3.779.4.96.6 is a 39 mm automatic dive-style watch with a stainless steel case and a ceramic bezel. It has a blue lacquered, polished dial with Swiss Super-LumiNova and a date display.
It is powered by a self-winding mechanical movement that beats at 25,200 vibrations per hour. A monocrystalline silicon balance spring gives a power reserve of up to 72 hours. The crown screws in, the case back screws down, and the bezel rotates in one direction only. The watch is water-resistant to 30 bar (300 m).
The sapphire crystal is scratch-resistant and has several layers of anti-reflective coating on both sides. The stainless steel bracelet closes with a double security folding clasp with a micro adjustment system.
