Grand Seiko Evolution 9 Ushio 300 Diver Green
SLGB025
- Case
- 40.8mm
- MSRP
- $12,400
- Movement
- Spring Drive
- Reserve
- 72h
VS
Building 1v1 comparison
Building 1v1 comparison
1v1 Watch Comparison
A focused side-by-side page for specs, fit, movement details, review notes, and enthusiast context.
SLGB025
215.32.44.21.01.002
Pair Review
Built from the saved specs and wearability notes for these two watches, then weighed against enthusiast priorities like fit, movement quality, practicality, finishing, value, and collector appeal.
Where it wins
Enthusiasts who want the most refined movement story and the smooth, distinctive character of Spring Drive.
Where it wins
Enthusiasts who want maximum technical dive-watch credentials and stronger water-resistance specs.
The Grand Seiko uses a Spring Drive caliber 9RB1 with 33 jewels, a 72-hour power reserve, and an impressive stated accuracy of ±20 seconds per year (±3 seconds per month), which is a standout claim for a mainspring-powered watch. The Omega uses the automatic caliber 8900 with 39 jewels, a 60-hour power reserve, METAS certification, and 15,000 gauss magnetic resistance; it also adds a jumping-hour feature that can be practical for travel. On paper, the Grand Seiko is the more technically distinctive movement thanks to Spring Drive precision, while the Omega offers more explicit certification and anti-magnetism plus proven automatic simplicity. Winner: Grand Seiko Evolution 9 Ushio 300 Diver Green
The Grand Seiko is the smaller and easier-wearing watch at 40.8mm in diameter, 12.9mm thick, 48.5mm lug-to-lug, and 122 grams in high-intensity titanium. Its wearability note says it feels noticeably slimmer and lighter than earlier GS divers, with a proper micro-adjust clasp making it one of the most comfortable luxury divers in its class. The Omega is much larger at 43.5mm wide, 16.4mm thick, and 49.8mm lug-to-lug, and the wearability note emphasizes substantial wrist presence and potential top-heaviness despite the rubber strap. The Omega will suit larger wrists and those who like a bold dive watch; the Grand Seiko is the more versatile and broadly comfortable option. Winner: Grand Seiko Evolution 9 Ushio 300 Diver Green
The Grand Seiko offers a green Ushio gradient dial, LumiBrite, sapphire crystal with inner anti-reflective coating, a titanium case and bracelet, a locking extension clasp with 6mm micro-adjustment, and 300m water resistance. Its notes highlight excellent legibility from faceted Evolution 9 hands and markers, plus a balanced, purposeful design, though the power-reserve indicator is somewhat divisive. The Omega brings a grey dial, applied indexes, a ceramic bezel, sapphire crystal, 600m water resistance, a date display, a helium escape valve, a rubber strap, and a pin buckle. Its notes stress rugged purpose, subdued tactical styling, strong movement technology, and travel-friendly jumping hours, but also its size and thickness as daily drawbacks. For pure everyday practicality, the Grand Seiko is easier to wear and better balanced, while the Omega is more purpose-built and technically robust. Winner: Grand Seiko Evolution 9 Ushio 300 Diver Green
The Grand Seiko carries a higher MSRP at 12,400 USD versus 8,000 USD for the Omega, so the Omega is the less expensive entry point. The Grand Seiko counters with a titanium case and bracelet, a highly distinctive Spring Drive movement, and a more elevated finishing-and-detail-driven collector appeal; the Omega counters with METAS certification, 15,000 gauss anti-magnetism, 600m water resistance, and a more straightforward tool-watch ownership proposition. If evaluating value strictly against listed MSRP and technical package breadth, the Omega is stronger on cost efficiency, while the Grand Seiko offers more exclusivity and movement character. Winner: Omega Seamaster Planet Ocean 600M Grey
Compared
SLGB025
215.32.44.21.01.002