Grand Seiko Watch Spring Drive Divers SBGE015J. The Grand Seiko watch is a divers watch that comes with a number of useful functionalities and Seikos Spring Drive technology. This timepiece is equipped with 9R65 calibre that utilizes elegantly the Spring Drive. It features a 72 hour power reserve. The case is both water and magnetic resistant. A power reserve indicator is available for the convenience of the wearer. Hands and markers are luminous for visibility in even the toughest of conditions. A date window is positioned at the 4 o clock mark.