Longines HydroConquest Longines HydroConquest is a collection of 41mm and 39mm diving watches. Comprising of automatic and quartz movement timepieces, they meet the stringent requirements exacted by this sport. They have unidirectional turning bezel, screw-in crown and screw-down case. The sapphire crystal is scratch-resistant with anti-reflective coating. Longines HydroConquest Collection features Calibers L633, L263, L541 and L667. Hour markers Available in steel on steel and steel on rubber strap. The hands and hour markers are coated with SuperLuminova. Water resistant up to 300 meters.