SLGB005

This new Spring Drive U.F.A. creation is based on the “Evolution 9 Style,” a unique design grammar that takes the fusion of Grand Seiko’s spirit with the aesthetic sensibilities of Japan to a higher level. Its textured, violet-colored dial expresses the breathtaking moment when dawn breaks over the frost-covered forests of the Shinshu region of central Japan, where all Grand Seiko Spring Drive watches are meticulously crafted.
Powered by the Caliber 9RB2, the groundbreaking movement receives the U.F.A. designation which stands for “Ultra Fine Accuracy,” this creation boasts an astounding annual rate of ±20 seconds, making it the most accurate wristwatch movement powered by a mainspring today.*
* As of September 2025, based on Grand Seiko’s research


Exterior: Ever brilliant steel, Caseback: Ever brilliant steel and sapphire crystal
Case back: See-through & Screw case back
Glass Material: Box shaped sapphire crystal
Glass Coating: Anti-reflective coating on inner surface
Case size: Diameter 37.0mm | Lug-to-lug 44.3mm | Thickness 11.4mm
Band width: 20mm
Clasp type: Three-fold clasp with push button release
The perimeter of Band: 193mm

Movement
Caliber no.: 9RB2 Instructions
Movement Type: Spring Drive
Power reserve: Approx. 72 hours(3 days)
Accuracy: ±20 seconds per year (±3 seconds per month)

Functions
Water resistance: 10 bar
Magnetic resistance: 4,800 A/m
Weight: 151 g

Other details / Features:
LIMITED EDITION on the case back
Serial number engraved on the case back
Screw-down crown
Clasp partly titanium and 18K rose gold
34 jewels
Power reserve indicator