The Seiko Prospex SPB423 is perfect for divers and watch enthusiasts. With a water resistance of 200m, it's great for underwater adventures. The blue gray dial with LumiBrite makes it easy to read in low light. It has a 70-hour power reserve, so you don't have to worry about winding it often. The watch has a stainless steel case and bracelet, with an approximate case diameter of 40.5mm and a weight of 180.0g, making it comfortable to wear all day.