The Longines HydroConquest L3.788.4.56.6 is a 42 mm stainless steel dive watch with a ceramic bezel, black lacquered dial and steel bracelet. Its Longines automatic calibre runs at 25,200 vph with a silicon balance spring and up to 72 hours of power reserve, and it is rated to 300 m with a screw-in crown and screw-down case back. That silicon hairspring and the ceramic bezel put it ahead of older HydroConquests and many entry dive watches that still use a standard spring and aluminium insert. It suits buyers who want a Swiss automatic diver with real water resistance and a long weekend-proof reserve without stepping up to Tudor or Omega money.
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Owners rate the HydroConquest as a solid, well-finished Swiss diver for the money, praising the ceramic bezel, legibility and long power reserve. Common complaints are the 42 mm size on smaller wrists and the bracelet clasp, which some find bulky.
The Longines HYDROCONQUEST L3.788.4.56.6 is an automatic dive-style watch with a 42 mm stainless steel case and a ceramic bezel. It is powered by an exclusive Longines automatic calibre and shows the date. The black lacquered polished dial uses Swiss Super-LumiNova.
The self-winding mechanical movement 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 is water-resistant to 30 bar (300 m). It has a unidirectional rotating bezel, a screw-in crown and a screw-down case back. 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.
