The pursuit of high accuracy has always been central to Grand Seiko’s philosophy. The new U.F.A. designation, standing for Ultra Fine Accuracy, marks a breakthrough with Caliber 9RB2, a movement defined not by accuracy per day, week, or month, but over an entire year. With an astonishing annual rate of ±20 seconds, or approximately ±3 seconds per month, it establishes a new benchmark among wristwatch movements powered by a mainspring*.

With a vacuum sealed chamber to maintain thermal stability, and a newly developed regulator,Caliber 9RB2 virtually eliminates accuracy deviation caused by post-assembly ageing.

Grand Seiko UFA Caliber 9RB2 stands as the most accurate mainspring-powered movement ever created*

Grand Seiko’s “Nature of Time” philosophy takes shape in the SBGM255 “Snowdrop” and SBGM257 “Moondrop” from the Elegance Collection. One evokes melting snow under spring sunlight, the other captures dew beneath an autumn moon. Their geometric spiral dials shift with light, revealing new depths at every angle, a surface in constant dialogue with its surroundings.

The intricate pattern imparts a refined sense of structure, a fitting complement to the Zaratsu-polished case and the high precision of the Caliber 9S66 GMT movement.

Inspired by the moonlit bark of white birch trees on the Hiraniwa Plateau, the SLGW007 follows the “Evolution 9 Style”, a design grammar that unites Grand Seiko’s watchmaking spirit with Japanese aesthetics.

Encased in a slender 9.95 mm stainless steel body, it is powered by the manual-winding Caliber 9SA4, which produces 36,000 vibrations per hour, delivering remarkable precision and an 80-hour power reserve.