Grand Seiko Evolution 9 Spring Drive "Ushio 300" Diver

The Grand Seiko SLGB025G represents a remarkable milestone in modern watchmaking, combining professional dive watch performance with the most advanced Spring Drive technology ever created. Part of the prestigious Evolution 9 Collection, this exceptional timepiece introduces the groundbreaking Spring Drive Calibre 9RB1 with U.F.A. (Ultra Fine Accuracy) technology, delivering an astonishing annual accuracy rate of ±20 seconds.

Inspired by the tranquil coastal waters surrounding Japan, the SLGB025G features a striking green "Ushio" dial. The Japanese word ushio translates to "tide," and the intricate dial pattern captures the movement and beauty of shallow ocean waters, creating a dynamic display that changes character as light moves across its surface.

A New Standard for Grand Seiko Dive Watches

Designed to meet the highest standards of professional diving, the SLGB025G combines robust functionality with the meticulous craftsmanship for which Grand Seiko is renowned. Its compact 40.8mm case is the smallest currently offered within the Grand Seiko diver's collection, providing exceptional comfort while maintaining a powerful wrist presence.

Crafted from High-Intensity Titanium, the case and bracelet are approximately 30% lighter than traditional stainless steel while offering exceptional durability and corrosion resistance. The lightweight construction ensures comfort during extended wear without compromising strength or performance.

Powered by Spring Drive U.F.A.

At the heart of the SLGB025G is the revolutionary Spring Drive Calibre 9RB1. Featuring Grand Seiko's new Ultra Fine Accuracy designation, the movement achieves a remarkable precision of ±20 seconds per year, making it one of the most accurate mainspring-powered wristwatch movements ever produced.

The movement offers approximately 72 hours of power reserve and showcases the signature smooth gliding seconds hand that has become synonymous with Spring Drive technology. This unique combination of mechanical craftsmanship and electronic regulation delivers unrivalled accuracy while preserving the soul of traditional watchmaking.

Engineered for Serious Diving

Built to perform in demanding environments, the SLGB025G features a professional-grade 300-metre water resistance rating, a screw-down crown and a unidirectional rotating bezel. LumiBrite-coated hands, indexes and bezel markings ensure exceptional legibility in low-light conditions, while the sapphire crystal provides outstanding scratch resistance and clarity.

The titanium bracelet is fitted with an advanced locking extension clasp featuring micro-adjustment capability. This allows for precise sizing adjustments throughout the day and provides additional extension when worn over a diving suit.

Key Features

• Reference: SLGB025G

• Collection: Grand Seiko Evolution 9

• Spring Drive Calibre 9RB1

• Ultra Fine Accuracy (U.F.A.)

• Accuracy of ±20 seconds per year

• Approx. 72-hour power reserve

• 40.8mm High-Intensity Titanium case

• Green "Ushio" textured dial

• Professional 300m diver's water resistance

• Unidirectional rotating bezel

• Sapphire crystal

• LumiBrite hands, markers and bezel

• Screw-down crown

• Power reserve indicator

• High-Intensity Titanium bracelet

• Micro-adjustment extension clasp

• 33 jewels