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Calibre 9F Grand Seiko: The most accurate mechanical movement of this century

The mechanics used in Grand Seiko's Caliber 9F engine use Astron Quartz technology. This technology delivers higher performance and greater endurance. The advent of the Seiko Quartz Astron in 1969 marked the beginning of the Grand Seiko Caliber 9F, which remains state-of-the-art technology to this day and sets new standards of accuracy that rise to ten times higher than even the best mechanical precision watches. Thirty-five years after the release of the world's first quartz wristwatch, this wristwatch has been recognized by the IEEE (Institute Of Electrical And Electronics Engineersm Inc.), a technical professional organization based in the United States, as an important achievement and registered on the IEEE Milestone list.

The Caliber 9F quartz movement relies on a battery as a power source. This battery will then supply electricity to the oscillator and make vibrations proper 32,768 times per second. The integration circuit ( IC ) will detect vibration and send a time signal to the driving motor, then the driving motor will activate according to this timing signal, accurately rotating a series of gears and clock hands.

Changing the date display in the blink of an eye.