Grand Seiko Watch Spring Drive Divers. SBGA031 is a diving watch made of high intensity titanium. It features Grand Seikos unique Spring Drive technology. This timepiece is equipped with 9R65 automatic calibre that has 30 bearing jewels. The watch is protected from water penetration and magnetic influences. It features a 72 hour power reserve and a power reserve indicator. A date window is positioned at the 3 o clock mark. This diving watch comes with a uni directional elapsed time bezel that can be removed. Hands and markers are luminous, which ensures readability in even the toughest of conditions. Additional functionalities include a screw crown, a screw case back and scratch resistant sapphire crystal glass with anti reflective coating.