This Seiko Chronograph SSB397 features an eye-catching dimensional black dial with three sub-dials for running seconds, timing and tracking in 24-hour military time. A tachymeter is shown on the outer portion of the dial. The hands and the 12 hour marker are filled with white luminous material for reading the time in the dark. The 41mm diameter brushed stainless steel case is 12.5mm thick and 48mm tip to tip. With the bracelet the weight is 152 grams. The stainless steel bracelet has a two position micro clasp and has a 22mm lug width. The movement is a Seiko Caliber 8T63 that is powered by a battery. Water resistance is 10 BAR or 100 meters.