Grand Seiko Watch Mechanical. SBGR055 is part of Grand Seikos Mechanical Calibre 9S Series. It has one very intriguing feature, mechanical automatic movement that comes with hand winding capability. The timepiece is equipped with 9S65 calibre that has 35 bearing jewels. This movement is protected from water penetration and magnetic influences. A date window is positioned at the 3 o clock mark. For convenience, SBGR055 features a 72 hour power reserve. Additional functionalities include second hand stop function, see through screw case back and high definition, scratch resistant sapphire crystal glass with anti reflective coating.