Longines HydroConquest

The Longines HydroConquest, reference L3.730.4.56.6, is a dive watch with a 39 mm round case in steel. The sunray black dial carries applied Arabic numerals and indexes alongside polished silvered hands. The case is 10.1 mm thick and 48.1 mm lug-to-lug, with water resistance rated to 300 metres; the case has a screw-down crown. Power comes from quartz calibre L156.3, powered by a RENATA 371 battery. A steel bracelet fastens with a double safety folding clasp. A date display and central seconds appear on the dial. The case has a unidirectional rotating bezel. A scratch-resistant sapphire crystal covers the hour and minute display, with several layers of anti-reflective coating on the underside.