Grand Seiko Ushio 300 SLGB025 COMING IN JUNE!
Please contact us if you are interested in this product.
The “Ushio 300,” a Spring Drive diver’s watch with phenomenal accuracy and a stunning green dial.
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. 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.
- SKU: SLGB025
- Brand: Grand Seiko
- Collection: Evolution 9 Collection
- Case: High-Intensity Titanium
- Case Size: Diameter 40.8mm Lug-to-lug 48.5mm Thickness 12.9mm
- Dial: Green tide
- Crystal: Sapphire crystal with anti-reflective coating on inner surface
- Case-Back: Screw case back
- Crown: non-screw down
- Bezel: Un-directional titanium bezel with ceramic insert
- Water Resistance: 300m
- Movement: 9RB1
- Movement Type: Automatic Spring Drive (U.F.A.)
- Accuracy: +/-20 sec/year
- Bracelet: High-Intensity Titanium
- Clasp: Locking extension clasp with micro-adjustment
- Warranty: 5 years
