The Longines HydroConquest 39mm is a Swiss automatic dive watch with a stainless steel case, a ceramic bezel insert and a green lacquered dial. Its movement runs at 25,200 vibrations per hour and uses a silicon balance spring for a power reserve of up to 72 hours, which is longer than the 38-hour reserves common on older HydroConquest generations. It is water-resistant to 30 bar and has a screw-in crown, a unidirectional rotating bezel and sapphire crystal with anti-reflective coating on both sides. At 39mm it sits between the larger 41mm and 43mm HydroConquest sizes, so it suits smaller wrists and buyers who want a dive watch that still works under a cuff. Against rivals like the Tudor Black Bay 58 and the Oris Aquis, it offers ceramic and silicon technology at a lower tier of the Swiss dive-watch market, though it lacks the brand cachet of those two.
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Owners of the 39mm HydroConquest generally praise the case size, the ceramic bezel and the long power reserve for the money. Common complaints are the bracelet clasp and the watch's thickness on the wrist.
The Longines Hydroconquest L3.779.4.06.6 is an automatic dive-style watch with a 39 mm stainless steel case and a ceramic bezel. The unidirectional rotating bezel and screw-in crown go with a water resistance of 30 bar. The dial is green, lacquered and polished, with Swiss Super-LumiNova.
Inside is a self-winding mechanical movement that beats at 25,200 vibrations per hour. It has a monocrystalline silicon balance spring and a power reserve of up to 72 hours. The watch shows the date.
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.
