The Longines Legend Diver is a reissue of a 1960 diving watch by Longines. While maintain the overall spirit & design of the original watch, Longines has updated the watch with modern upgrades such as a sapphire crystal, screw in crowns & a screw in case back allowing for an impressive 300 water resistance rating. This watch features: Polished stainless steel case. Blue lacquered dial Luminous index & numeral hour markers. Black lacquered bi-directional rotating internal bezel located beneath the crystal & operated by the crown at the 2 o'clock position. Luminous triangle marks the start position of the bezel. Crown at the 4 o'clock position operated the time setting of the watch. Both crowns are screw-in to ensure water resistance. Both crowns have a stamped criss-cross checkered design. Case back embossed with a diver symbol. Longines caliber L888, beats at 25,200 vph, contains 21 jewels & has an approximate power reserve of 72 hours.