Evolution 9 Spring Drive U.F.A. Ushio 300 Diver SLGB025

Grand Seiko

Evolution 9 Spring Drive U.F.A. Ushio 300 Diver SLGB025

Name: Evolution 9 Spring Drive U.F.A. Ushio 300 Diver SLGB025
Brand: Grand Seiko
SKU: SLGB025
Price: 17700.00 AUD
Availability: OutOfStock

SLGB025

AUD $17,700

In 2025, Grand Seiko unveiled the Spring Drive Calibre 9RB2, a groundbreaking movement that received the then-new U.F.A. designation, standing for “Ultra Fine Accuracy.” Boasting an annual accuracy rate of ±20 seconds, Calibre 9RB2 earned the distinction of being the most accurate wristwatch movement powered by a mainspring.* This model is powered by Calibre 9RB1, featuring an improved construction that makes it ideal for sporting conditions while sharing the same attributes as the Calibre 9RB2.
The term ushio, which means “tide” in Japanese, evokes the waters that surround the Japanese archipelago. The green dial draws from the tranquil beauty of shallow coastal waters near the shore.
* As of April 2026, based on Grand Seiko’s research.

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Movement

Caliber no: 9RB1

Movement Type: Spring Drive

Power reserve: Approx. 72 hours (3 days)

Accuracy: ±20 seconds per year (±3 seconds per month)

Case

Exterior: High-Intensity Titanium

Case back: Screw case back

Glass Material: Sapphire crystal

Glass Coating: Anti-reflective coating on inner surface

LumiBrite: LumiBrite on hands; index(es) and bezel

Case size: Diameter 40.8mm Lug-to-lug 48.5mm Thickness 12.9mm

Strap

Band width: 21mm

Clasp type: Locking extension clasp with micro-adjustment

Bracelet Length: 195mm

Dial

Green

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About the brand

Grand Seiko

Grand Seiko was born in 1960 with an aim of creating the very best watch of which the company was capable. Each watch is handmade in Japan by skilled specialists who ensure the high precision, legibility, and durability for which Grand Seiko has become renowned. Deeply rooted in Japanese heritage, and its brand philosophy, "The Nature of Time", celebrates the Japanese spirituality of time that is deeply inspired by nature brought to life by "Takumi" the skilled craftsperson. Mechanical, Quartz and Spring Drive movements power the watches in the Grand Seiko collection embracing the very same heritage, sport and elegant design as well as the groundbreaking evolution 9 movement.