The Longines Legend Diver L37644166 updates a 1959 dive watch design with a 39 mm stainless steel case and the collection’s signature twin-crown layout. The watch uses an internal rotating diving flange controlled by the upper crown, a configuration that protects the bezel from accidental movement. The white matte dial features elongated hour markers, polished hands and Super LumiNova across the indexes for low light visibility. Inside is the Longines Calibre L888, an automatic movement with a silicon balance spring, magnetic resistance and a power reserve of 72 Hours. The case measures 12.70 mm thick with a screw in crown and screw down case back, rated to 300 meters of water resistance. A stainless steel bracelet completes the watch and is fitted with a folding clasp.