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
217.30.42.21.01.001
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
Collectors who value Spring Drive innovation and extraordinary stated accuracy.
Where it wins
Buyers who want stronger dive-tool credentials and higher water resistance.
Omega uses the automatic Co-Axial caliber 8912 with 39 jewels, 3.5 Hz / 25,200 vph, a 60-hour power reserve, METAS certification, and a listed 15,000-gauss magnetic resistance. That gives it a strong technical profile, especially for robustness and verified performance standards. Grand Seiko counters with the Spring Drive caliber 9RB1, 33 jewels, a 72-hour power reserve, and a stated accuracy of ±20 seconds per year, which is exceptional for a mainspring-powered watch and the standout spec in the pair. On pure horological sophistication and timekeeping distinction, the Grand Seiko has the more unusual and advanced movement concept; on certification-backed tool-watch toughness, Omega has the more complete package. Winner: Grand Seiko
Omega’s 42 mm steel case, 13.79 mm thickness, 47.5 mm lug-to-lug, and 177 g weight suggest a substantial wrist presence. The pre-existing wearability notes emphasize that this generation is slimmer and more balanced than older Planet Oceans, but it still wears larger and thicker than smaller dive icons. Grand Seiko is slightly smaller at 40.8 mm, thinner at 12.9 mm, but longer at 48.5 mm lug-to-lug; its high-intensity titanium construction keeps the weight down to 122 g, which should make it feel dramatically lighter and easier for long wear. The supplied wearability summary says the Ushio 300 finally feels cohesive, slimmer, and more comfortable than prior GS divers, with the bracelet and micro-adjust clasp especially improving on-wrist balance. For outright comfort and low-fatigue wear, Grand Seiko is the clearer winner; Omega still offers more wrist presence and a more muscular dive-watch stance. Winner: Grand Seiko
Omega’s black dial, ceramic bezel, Super-LumiNova, domed sapphire with inner AR, screw-in crown, helium escape valve, and 600 m water resistance make it the more purpose-built dive instrument. It also has a clean no-date layout, which helps legibility and symmetry, and the steel bracelet with comfort setting and diver extension adds practical versatility. Grand Seiko brings a green Ushio gradient dial with strong visual depth, LumiBrite, inner AR sapphire, screw-down crown, and a locking extension clasp with micro-adjustment; however, it has 300 m water resistance and no listed helium valve, so it is still very capable but less aggressively engineered for deep-dive use. In everyday practicality, the Grand Seiko’s lighter titanium case and smoother Spring Drive experience are compelling, but Omega is the more straightforward tool watch for travel, sports, and rougher use. Winner: Omega
Omega’s listed MSRP is $9,200, while Grand Seiko’s is $12,400, so the Omega starts with a more favorable price position. The Omega also carries useful heritage signals for a modern dive watch: Seamaster Planet Ocean, METAS certification, 15,000-gauss resistance, and 600 m capability all reinforce a durable, professionally minded ownership experience. Grand Seiko offers stronger movement novelty and a more artisanal collector appeal through Spring Drive and Evolution 9 design language, but the higher MSRP and the divisive dial power reserve mean it asks more from the buyer. Since neither watch has resale or maintenance data listed, the value discussion comes down to specification density, practicality, and brand/collection cachet as provided. On that basis, Omega offers the stronger value proposition, while Grand Seiko offers the more specialized enthusiast draw. Winner: Omega
Compared
SLGB025
217.30.42.21.01.001