From Japan, Grand Seiko finally gave us the ultra-high-end, world record level accurate, spring-drive dive watch in a size smaller than 41mm that fans have been asking for. The Spring Drive U.F.A. Ushio 300 Diver demanded attention. Powered by the Caliber 9RB1 UFA with “Ultra Fine Accuracy” of ±20 seconds per year (a world record, by the way, from a caliber introduced last year), the High-Intensity Titanium case measures a relatively compact 40.8mm by 12.9mm, a significant reduction from previous Spring Drive divers.
The bracelet is made of the same material and features 6mm of microadjustment in 2mm increments, and an 18mm dive extension. With classic green and blue variations of the brand’s “Ushio” tide-inspired fumé dials and a 120-click unidirectional bezel with a ceramic insert, it’s a user-friendly-sized expression of an ultra-luxury diver with 300 meters of water resistance. At $12,400, it’s not an inexpensive proposition, but it does offer the most accurate movement available on a diver with materials and finishing that are arguably best in class.
“It meets the demands of global consumers as Grand Seiko evolves from the historical Seiko diver’s watch,” Akio Naito, the President of Seiko Watch Corporation, says in an interview regarding the Spring Drive U.F.A. Ushio 300 Diver.
Andy Hoffman
2026-04-30 15:00:00