Fortis Men's 670.17.41 K B-42 MARINEMASTER Day/Date Analog Display Automatic Self Wind Black Watch Automatic Swiss movement 2836-2;screw-down case back with historic fortis motive Unidirectional turning bezel with 5 minute scale (120 divisions); luminous hands and hour markers; day and date indication bilingual English and German Automatic-self-wind Movement Case Diameter: 42mm Water Resistant To 660 Feet