The Longines HydroConquest L3.788.4.90.6 is a 42 mm stainless steel automatic watch featuring a black lacquered polished dial. It is powered by the Longines Calibre L888.5, a self-winding mechanical movement operating at 25,200 vibrations per hour, offering a power reserve of approximately 72 hours. The watch includes a unidirectional rotating ceramic bezel, a screw-in crown, and is water-resistant up to 300 meters. The stainless steel bracelet is equipped with a double security folding clasp and a micro-adjustment system. Reference number: L3.788.4.90.6.