Prospex U.S. Special EditionCelebrates Seiko Prospex's ongoing efforts to promote ocean exploration and conservationAutomatic diver with manual winding capability21,600 vibrations per hourPower reserve: approximately 41 hours24 jewelsBlue ceramic unidirectional rotating elapsed timing bezelIntricately patterned blue dial inspired by the turtle shellDay/date calendar with day in both English and KanjiLumiBrite hands and markersSapphire crystal with anti-reflective coating on the inner surfaceScrewdown crownScrewdown Special Edition caseback with sea turtle imageCase diameter: 45.0mmStainless steel case and braceletAdditional blue silicone strapWater-resistant to 200 meters (660 feet), Diver's Watch. Follows ISO standards and is suitable for scuba divingCaliber 4R36