The Longines HydroConquest L3.781.4.56.6 is a striking 41 mm stainless‑steel automatic diver’s watch, featuring a sunray‑black dial with applied Arabic numerals and indexes, framed by a unidirectional ceramic bezel. Powered by calibre L888 to 25,200 vph with a 72‑hour power reserve, it includes date, screw‑in crown, scratch‑resistant sapphire crystal with anti‑reflective coating on both sides, 30 bar water resistance, and a matching steel bracelet with double‑safety folding clasp.