Specifications Model:ST1780 Diameter: 40mm Thickness: 11mm Buckle: Pin Buckle Dial Window: Sapphire Glass Material: 316L Stainless Steel Movement: Sea-Gull 1780 Waterproof: 50m (5 ATM) Warranty: one year warranty. Buy with confidence. Classic design Exhibition case back Mechanical chronograph movement Stainless steel case brand new