Invicta Men's 4730 Specialty Ocean Ghost Mechanical Watch Seagull ST-1900 Series - Mechanical-hand-wind movement; must be hand-wound and should be wound daily To wind the watch, turn the crown clockwise while in its normal operating position until you feel resistance Case diameter: 45 mm; Scratch-resistant-sapphire crystal Stainless-steel case; White-Mother-of-Pearl dial; Chronograph functions Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving