The Longines HydroConquest 39mm is a Swiss automatic dive watch with a stainless steel case, ceramic bezel insert and 300 m water resistance. Its silicon balance-spring movement runs at 25,200 vph with up to 72 hours of power reserve, and the sapphire crystal has anti-reflective coating on both sides. At 39 mm it wears smaller than the 41 mm and 43 mm HydroConquest models, which suits wrists that find those too large. Against rivals like the Tudor Black Bay 58 and Oris Aquis, it offers comparable dive-watch specs and a silicon hairspring at a lower tier of the market, though its clasp and finishing are a step below pricier divers.
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Owners rate the 39 mm HydroConquest as a solid, well-built diver that wears comfortably and keeps good time. Many praise the ceramic bezel and the silicon movement, while some find the clasp and bracelet finishing below what more expensive divers offer.
This is a 39 mm automatic dive watch from the Longines Hydroconquest collection. The case is stainless steel with a ceramic bezel. The unidirectional rotating bezel and screw-in crown help it handle underwater use, and it is water-resistant to 30 bar (300 m).
Inside is a self-winding mechanical movement, an exclusive Longines automatic calibre. It beats at 25,200 vibrations per hour. It has a monocrystalline silicon balance spring and a power reserve of up to 72 hours. The dial shows the date.
The black lacquered polished dial uses Swiss Super-LumiNova. A scratch-resistant sapphire crystal with several layers of anti-reflective coating on both sides covers it. The stainless steel bracelet has a double security folding clasp with a micro adjustment system.
