Grand Seiko Watch Spring Drive SBGA003J. Seikos Spring Drive mechanism is something unique and made entirely in house. This watch is equipped with 9R86 calibre that utilizes elegantly the Spring Drive technology. The movement is protected from water penetration and magnetic influences. It comes with 30 bearing jewels and a 72 hour power reserve. A power reserve indicator is available for the convenience of the wearer. The dial features a date display at the 3 o clock mark. Additional functionalities include a screw crown, a see through screw case back and scratch resistant sapphire crystal glass with anti reflective coating.