In 2025, Grand Seiko unveiled the Spring Drive Caliber 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, Caliber 9RB2 earned the distinction of being the most accurate wristwatch movement powered by a mainspring.* This model is powered by Caliber 9RB1, featuring an improved construction that makes it ideal for sporting conditions while sharing the same attributes as the Caliber 9RB2. The term ushio, which means “tide” in Japanese, evokes the waters that surround the Japanese archipelago. This creation’s blue dial reflects the vast expanse of the sea through a gradient that captures light streaming into the deep ocean.

• specifications
• Brand & family
• more features

Specifications

GenderMen

MovementSpring Drive

Case Size41mm

Case MaterialTitanium

Dial ColorBlue

Water Resistance30 BARS

FunctionalityPower Reserve

Strap MaterialTitanium

Brand & family

• Family Name: Evolution 9
• Model No.: SLGB023
• Gender: Men

More Features

Buckle MaterialTitanium

Strap ColourSilver

Display TypeAnalog

Buckle TypeFolding Clasp

Dial ShapeRound

Glass MaterialSapphire Crystal

Country of OriginJapan