Luminox Field 42mm 1827 Ivory Dial Brown Leather Mens Watch Swiss Quartz Movement Field Series Swiss-quartz Movement Case Diameter: 42mm Water resistant 200m (660ft):in general, suitable for professional marine activity and serious surface water sports, but not diving Quartz movement Case diameter: 42 mm Stainless steel case Scratch resistant synthetic sapphire Water resistant to 660 feet (200 M): suitable for recreational scuba diving