Features: Stainless Steel Case Silicone Strap Automatic Movement Caliber: Seiko NH36A Power Reserve Up To 40 Hours Sapphire Crystal Yellow Dial Analog Display Luminous Hands And Markers Power Reserve Helium-Safe Day And Date Display Uni Directional Rotating Bezel Screw Down Crown Engraved Case Back Buckle Clasp 1000M Water Resistance Approximate Case Diameter: 50mm Approximate Case Thickness: 15mm