Seiko Prospex Automatic Diver Mens Watch SRPE37 Prospex Automatic Diver. Designed for those who treat life as the ultimate adventure, the Seiko Prospex line meets every challenge with technological excellence and winning design. Inspired by Seiko?s most iconic diving styles, this distinctive watch includes such upgrades as a black ceramic one-way rotating elapsed timing bezel, magnified date window and sapphire crystal with anti-reflective coating on the inner surface. The white dial, with LumiBrite hands and markers, has a 3-D pattern reflecting the shape of the black and gray bezel edge. For reliable underwater timekeeping, the 23-jewel automatic movement beats at a frequency of 21,600 vibrations per hour, with a power reserve of approximately 41 hours, and can be wound manually or automatically. Crafted of stainless steel, with black silicone strap and secure screwdown crown and caseback, this high-intensity timepiece follows ISO standards for scuba diving. 200m Water ResistantCase: Stainless steel caseCase Diameter: 44mmCase Thickness: 12.81mmCase Length: 48.7mmCrystal:Sapphire crystal with anti-reflective coating on the inner surfaceWater Resistance: 200 meters (660 feet), follows ISO standards and is suitable for scuba divingDial Color: WhiteStrap: Black silicone strapLug Width: 22mmMovement: Caliber 4R3521,600 vibrations per hour23 jewelsPower reserve: approximately 41 hours Prospex Automatic Diver. Designed for those who treat life as the ultimate adventure, the Seiko Prospex line meets every challenge with technological excellence and winning design. Inspired by Seiko?s most iconic diving styles, this distinctive watch includes such upgrades as a black ceramic one-way rotating elapsed timing bezel, magnified date window and sapphire crystal with anti-reflective coating on the inner surface. The white dial, with LumiBrite hands and markers, has a 3-D pattern reflecting the shape of the black and gray bezel edge. For reliable underwater timekeeping, the 23-jewel automatic movement beats at a frequency of 21,600 vibrations per hour, with a power reserve of approximately 41 hours, and can be wound manually or automatically. Crafted of stainless steel, with black silicone strap and secure screwdown crown and caseback, this high-intensity timepiece follows ISO standards for scuba diving. 200m Water Resistant Case: Stainless steel case Case Diameter: 44mm Case Thickness: 12.81mm Case Length: 48.7mm Crystal:Sapphire crystal with anti-reflective coating on the inner surface Water Resistance: 200 meters (660 feet), follows ISO standards and is suitable for scuba diving Dial Color: White Strap: Black silicone strap Lug Width: 22mm Movement: Caliber 4R35 21,600 vibrations per hour 23 jewels Power reserve: approximately 41 hours