Manual and automatic winding capabilities 21,600 vibrations per hour Power reserve: approximately 41 hours 23 jewels Date calendar Screwdown crown and caseback One-way rotating elapsed timing bezel LumiBrite hands and markers Case Diameter 43.8 mm Stainless Steel Bracelet Water Resistance: Diver's Watch to 200 meters (660 feet). Meets ISO standards and is suitable for scuba diving. Caliber 4R35