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Watches and Wonders 2026: Grand Seiko Spring Drive UFA Ushio 300 Diver's Watches - The Brand's Most Precise and Compact Spring Drive Diver's Watches



At Watches and Wonders 2026, Grand Seiko added two brand new Spring Drive UFA Ushio 300 dive watches in order to its Evolution 9 selection - the SLGB023 as well as SLGB025. These watches would be the first to feature the brand new Spring Drive 9RB1 motion and have a 40. 8mm case diameter. These two Spring Drive UFA Ushio three hundred dive watches are Grand Seiko's smallest and most accurate dive watches to date, run by the Spring Drive movements. Below is a detailed summary of these two new Spring Drive UFA Ushio 300 jump watches.

New Spring Drive 9RB1 Movement

Grand Seiko's Spring Drive movement utilizes a rate regulation method unique from its Swiss alternatives. Instead of a traditional escapement, this uses a so-called "pulley, inch regulated and braked with a quartz oscillator and electric control circuitry. Furthermore, the whole Spring Drive system works without a battery, as the quartz module is entirely driven by the mainspring.

The Spring Drive movement was trademarked in the late 1970s and very first introduced in 1988, eventually growing into the Spring Drive 9R65 movement launched in 2004. This particular movement marked a significant change for the brand's early actions: it combined automatic turning and a 72-hour power reserve along with movement technology capable of attaining ±15 seconds of precision per month.

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In 2025, at Watches and Wonders, Grand Seiko unveiled an additional major upgrade to the Springtime Drive movement: the automated 9RB2 movement, also offering a 72-hour power reserve. The brand new movement is named "Spring Drive UFA, " where "UFA" stands for "Ultra Fine Accuracy, " boasting an annual mistake of only ±20 secs. Note that this refers to yearly error, not daily, every week, or monthly. This degree of precision equates to approximately ±3 seconds per month, 12 mere seconds more accurate than the earlier generation movement, leading Seiko to claim it as their the majority of accurate mainspring-driven wristwatch up to now.

This high level of reliability is achieved through recently improved manufacturing and completing processes applied to the quartz oscillator and integrated brake lines. Furthermore, this new movement presents a calibration mechanism initially in a Spring Drive activity, used during servicing to fix for any timekeeping inaccuracies that could have occurred due to long-term utilize.

A year later, Grand Seiko 1st applied Spring Drive UFA technology to dive watches, launching two new Development 9 Spring Drive UFA Ushio 300 dive watches, SLGB023 and SLGB025, each powered by the new Spring Drive 9RB1 movement. The actual movement, hand-assembled at the Shinshu watchmaking workshop in Shiojiri City, central Nagano Prefecture, measures 30mm in size and 4. 7mm within thickness-a compact size which contributes to the watch's strong case design.

The new watch's water resistance, construction, and possibility of being read easily: Dive watches have lengthy transcended their purely practical purpose as tools with regard to professional divers, becoming one of the most sought-after timepieces by enthusiasts. However , not all watches that will resemble dive watches suit actual diving: for a view to be officially recognized as the "dive watch, " it should meet specific requirements, mainly defined by the international regular ISO 6425. These requirements specifically address water resistance, possibility of easy-reading, and robustness. Grand Seiko explicitly states that the new dive watch is made for professional use-therefore, it is essential to analyze the construction of the Spring Generate UFA Ushio 300 dance watch and the standards that complies with.

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Water resistance is a primary concern. According to ISO 6425, water resistance must be at least 100 meters, with actual stress testing conducted at a minimum of 25% of the nominal level. Taking the new Spring Drive UFA Ushio 300 ski watch as an example, its examined pressure is approximately 37. five bar, exceeding the minimal water resistance depth of 3 hundred meters (30 bar) through 25%. The Spring Push UFA Ushio 300 includes a compact movement, with a situation diameter of only 40. 8 mm and a width of only 12. 9 mm, significantly smaller than prior Grand Seiko dive enjoy cases.

Besides water resistance, possibility of being read easily is also a core requirement for dive watches. The ISO 6425 standard stipulates that immerse watches must have continuous moment markers, clearly legible five-minute interval markers, and lustrous reference markers (usually triangular) on the bezel to indicate jump time. To meet these specifications, the new Spring Drive UFA Ushio 300 is equipped with any unidirectional rotating bezel together with 120 graduations for exact adjustment and meets almost all specified characteristics. The viser is inlaid with hard, available in blue or eco-friendly depending on the version, ensuring scrape and corrosion resistance.

Possibility of being read easily in low light conditions additionally meets ISO 6425 specifications: after exposure to light, this timepiece must be clearly readable at nighttime from a distance of 25 cm. Therefore , the bezel indicators, hands, and rectangular hours markers of the new Spring Drive UFA Ushio 300 dive watch are covered with a large amount of green fine luminescent material, Lumibrite. The switch continues the "Ushio" style theme that Grand Seiko dive watches have used because 2022, offering two pallettes: a blue dial comprising the deep ocean, along with a green dial inspired simply by shallow waters. Both watches feature a gradient design, shifting from a darker tone close to the dial to a lighter in weight tone at the center. A practical improvement is the power reserve indication, which has been moved to the side from the dial.

Another key requirement of a dive watch is actually corrosion resistance. According to ISO 6425 standards, corrosion opposition is assessed through a sodium spray test; after 48 hours of exposure to deserving of spray, neither the watch by itself nor the strap ought to exhibit any noticeable visible or tactile changes. To satisfy this requirement, the new Spring Drive UFA Ushio 300 Diver watch features a circumstance and strap made of "high-strength titanium, " a materials that, according to the brand, is around 30% lighter than stainless-steel. The strap is equipped with some sort of newly developed folding hold with a safety mechanism and also an integrated micro-adjustment system. This method offers three-stage adjustment as much as 6 mm, and can be prolonged an additional 18 mm-for instance, for wearing over a scuba diving suit-for a total adjustment selection of up to 24 mm.

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