Grand Seiko Watch Mechanical SBGR051. This Grand Seiko automatic watch comes with a number of useful functionalities it is a mechanical automatic timepiece that is equipped with hand winding capability. Its calibre is 9S65 that has 35 bearing jewels. The movement features a 72 hour power reserve. This watch is protected from both water penetration and magnetic fields. A date window is positioned at the 3 o clock mark. Additional functionalities include see through screw case back and high definition sapphire crystal glass with anti reflective coating.