Invicta Men's 'Aviator' Quartz Stainless Steel and Nylon Casual Watch, Color:Grey (Model: 18780) Chronograph with 60 second, 60 minute and 1/10 sub dials, push crown , uni-directional 50mm stainless steel stainless steel with sapphire crystal Quartz Movement Case Diameter: 50mm Water resistant to 100m (330ft): in general, suitable for swimming and snorkeling, but not diving