The Longines HydroConquest L3.779.4.99.6 is a 39mm stainless steel dive watch with a frosted blue sunray dial, a ceramic unidirectional bezel and 300m water resistance. It runs Longines' automatic Caliber L888 with roughly a 72-hour power reserve, protected by an anti-reflective sapphire crystal. The 39mm case suits smaller wrists and everyday wear better than the 41mm and 43mm HydroConquest sizes, while keeping the screw-down crown, screw-down caseback and dive-rated build. Against rivals like the Tudor Black Bay 58 and Oris Aquis, it offers ceramic bezel and a long power reserve at a lower tier of finishing and brand cachet.
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Owners of the 39mm HydroConquest generally rate it as a solid, well-built diver that wears smaller than its specs suggest. The ceramic bezel and long power reserve draw frequent praise, while the bracelet weight and clasp bulk come up as gripes.
The Longines HydroConquest L3.779.4.99.6 is a dive watch with a 39mm stainless steel case. It has a ceramic unidirectional bezel, a screw-in crown and a solid screw-down caseback. It is water resistant to 300 meters and suitable for professional diving.
The dial is a frosted blue sunray finish with applied indexes. The polished silvered hands are filled with Swiss Super-LumiNova for readability in low light. The dial shows hours, minutes, seconds and date. An anti-reflective sapphire crystal protects it.
The watch is powered by the automatic Longines Caliber L888, a mechanical movement with an approximately 72-hour power reserve. The stainless steel bracelet closes with a double-security folding clasp that has a micro-adjustment system.
