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Grand Seiko’s Ushio 300 Diver Wins 2026 GPHG Sports Watch Prize
Image: Grand Seiko
Grand Seiko’s Ushio 300 Diver, reference SLGB023, won the Sports Watch Prize at the 2026 Grand Prix d’Horlogerie de Genève, according to Grand Seiko’s announcement.
The win marks external, juried validation, placing a Japanese Spring Drive diver on the podium in a category collectors track closely.
SLGB023 houses Spring Drive U.F.A. Caliber 9RB1, based on the 2025 Caliber 9RB2. The specs stand out: 72 hours of power reserve and annual accuracy of ±20 seconds, unusually precise for a sports diver.
The watch features a High Intensity Titanium case and bracelet, plus a 120 click bezel with a ceramic insert. The official GPHG prize list confirms this as the Sports Watch Prize, while the overall Aiguille d’Or went to Rexhep Rexhepi’s Chronograph Flyback.
| Reference | SLGB023 |
| Price | £10,500 (reported) |
| Case | 40.8 mm case; case and bracelet in High-Intensity Titanium; 120-click bezel with ceramic insert |
| Movement | Spring Drive U.F.A. Caliber 9RB1, 72-hour power reserve, ±20 seconds/year accuracy |
| Water Resistance | 300 metres (reported) |
Source: grand-seiko.com
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