LONGINES SPIRIT | 40 mm | AutomaticDate, Self winding mechanical movement beating at 25'200 vibrations per hour, with a monocrystalline silicon balance spring power reserve up to 72 hours. Screw in crown, Water resistant to 10 bar, Scratch resistant sapphire crystal, with several layers of anti reflective coating on both sides. Black matt dial, Swiss Super LumiNova. Leather strap bracelet, With buckle. For nearly a century, LONGINES has accompanied some of the worlds greatest explorers