This Sea Explorer is a 42.5mm watch with a blue Super-LumiNova® dial, as well as hands, indexes and bezel markings, for optimal visibility in dark underwater conditions. The Sea Explorer features an automatic three-hand date movement, sapphire crystal, a screw-down crown, and a plated black stainless steel bracelet. The "Diver's" marking on the dial asserts that this is an ISO 6425 Certified watch with 20 ATM water resistance. Automatic/3 Hand Date Blue 42.5MM Stainless Steel Black Black Stainless Steel 20 ATM