Grand Seiko Evolution 9 Spring Drive "Ushio 300" Diver

The Grand Seiko SLGB023 represents one of the most significant advancements in modern watchmaking, combining professional dive watch performance with the extraordinary precision of Spring Drive U.F.A. (Ultra Fine Accuracy) technology. Part of the acclaimed Evolution 9 Collection, this remarkable timepiece is powered by the Grand Seiko Calibre 9RB1, delivering an astonishing accuracy of ±20 seconds per year; making it one of the most accurate mainspring-powered wristwatches ever created.

Designed for those who demand uncompromising performance both above and below the water, the SLGB023G showcases Grand Seiko's relentless pursuit of precision, innovation and craftsmanship.

Inspired by the Deep Blue Ocean

The SLGB023 features a stunning blue variation of Grand Seiko's renowned "Ushio" dial. The Japanese word ushio translates to "tide", and the intricate dial pattern draws inspiration from the powerful ocean currents that surround the Japanese archipelago. A captivating blue gradient reflects light as it penetrates deeper into the sea, creating exceptional depth and visual character.

Combined with the sharp lines of the Evolution 9 design language, the dial delivers outstanding legibility while capturing the beauty of nature that lies at the heart of Grand Seiko's philosophy.

Revolutionary Spring Drive U.F.A. Movement

At the heart of the watch is the groundbreaking Spring Drive Calibre 9RB1. Hand-assembled by master craftsmen at the Shinshu Watch Studio in Japan, the movement combines the traditional energy of a mainspring with Grand Seiko's unique Spring Drive regulation system. The result is exceptional precision, a perfectly smooth sweeping seconds hand and a power reserve of approximately 72 hours.

The U.F.A. designation (Ultra Fine Accuracy) represents a new pinnacle for Grand Seiko, offering annual precision that surpasses virtually every mechanical timepiece on the market today.

Engineered for Serious Diving

The SLGB023 has been developed as a true professional dive watch, featuring 300 metres of water resistance, a screw-down crown and a unidirectional rotating bezel. Every element has been carefully engineered to deliver reliability in demanding environments while maintaining the refined finishing expected from Grand Seiko.

Its 40.8mm case makes it the smallest Grand Seiko diver currently available, offering exceptional comfort on the wrist without compromising capability. Crafted from High-Intensity Titanium, both the case and bracelet are approximately 30% lighter than stainless steel while offering superior corrosion resistance and durability.

Exceptional Comfort and Wearability

The titanium bracelet is equipped with Grand Seiko's advanced locking extension clasp with micro-adjustment. This innovative system allows quick sizing adjustments throughout the day and can be extended when worn over a diving suit, ensuring maximum comfort in every situation.

Combining lightweight construction, professional-grade performance and exceptional finishing, the SLGB023 is a diver's watch that performs as beautifully as it looks.

Key Features

• Reference: SLGB023

• 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

• Blue "Ushio" gradient textured dial

• Sapphire crystal with anti-reflective coating

• Unidirectional rotating bezel

• Screw-down crown

• Power reserve indicator

• LumiBrite hands, indexes and bezel

• High-Intensity Titanium bracelet

• Locking extension clasp with micro-adjustment

• 300m professional diver's water resistance

• 33 jewels