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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 completely new Spring Drive UFA Ushio 300 dive watches to help its Evolution 9 variety - the SLGB023 along with SLGB025. These watches are classified as the first to feature the fresh Spring Drive 9RB1 movements and have a 40. 8mm case diameter. These two Spring Drive UFA Ushio 600 dive watches are Grand Seiko's smallest and most specific dive watches to date, power by the Spring Drive activity. Below is a detailed summary of these two new Spring Drive UFA Ushio 300 immerse watches.

New Spring Drive 9RB1 Movement

Grand Seiko's Spring Drive movement implements a rate regulation method particular from its Swiss furnishings. Instead of a traditional escapement, the idea uses a so-called "pulley, micron regulated and braked by just a quartz oscillator and electric powered control circuitry. Furthermore, the full Spring Drive system performs without a battery, as the quartz module is entirely motorized by the mainspring.

The Spring Drive movement was complex in the late 1970s and initial introduced in 1988, eventually developing into the Spring Drive 9R65 movement launched in 2004. That movement marked a significant improve for the brand's early moves: it combined automatic hustleing and a 72-hour power reserve using movement technology capable of reaching ±15 seconds of accuracy and reliability per month.

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In 2025, at Watches and Wonders, Grand Seiko unveiled a different major upgrade to the Spring and coil Drive movement: the intelligent 9RB2 movement, also featuring a 72-hour power reserve. The new movement is named "Spring Drive UFA, " where "UFA" stands for "Ultra Fine Accuracy, " boasting an annual blunder of only ±20 moments. Note that this refers to 12-monthly error, not daily, once a week, or monthly. This higher level of precision equates to approximately ±3 seconds per month, 12 just a few seconds more accurate than the past generation movement, leading Seiko to claim it as their nearly all accurate mainspring-driven wristwatch at this point.

This high level of exactness is achieved through new improved manufacturing and a finish processes applied to the quartz oscillator and integrated promenade. Furthermore, this new movement discusses a calibration mechanism initially in a Spring Drive mobility, used during servicing to adjust for any timekeeping inaccuracies that will have occurred due to long-term work with.

A year later, Grand Seiko initially applied Spring Drive UFA technology to dive watches, launching two new Progress 9 Spring Drive UFA Ushio 300 dive watches, SLGB023 and SLGB025, equally powered by the new Spring Drive 9RB1 movement. Often the movement, hand-assembled at the Shinshu watchmaking workshop in Shiojiri City, central Nagano Prefecture, measures 30mm in length and 4. 7mm with thickness-a compact size in which contributes to the watch's solid case design.

The new watch's water resistance, construction, and possibility of easy-reading: Dive watches have longer transcended their purely efficient purpose as tools to get professional divers, becoming very sought-after timepieces by debt collectors. However , not all watches this resemble dive watches fit actual diving: for a see to be officially recognized as any "dive watch, " it should meet specific requirements, generally defined by the international typical ISO 6425. These criteria specifically address water resistance, possibility of being read easily, and robustness. Grand Seiko explicitly states that it has the new dive watch was created for professional use-therefore, it is essential to always check the construction of the Spring Travel UFA Ushio 300 jump watch and the standards the item complies with.

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Water resistance is a primary account. According to ISO 6425, this resistance must be at least 100 meters, with actual tension testing conducted at at the least 25% of the nominal degree. Taking the new Spring Drive UFA Ushio 300 dance watch as an example, its tried pressure is approximately 37. 5 various bar, exceeding the moderate water resistance depth of 500 meters (30 bar) by simply 25%. The Spring Commute UFA Ushio 300 includes compact movement, with a event diameter of only 40. 8 mm and a depth of only 12. 9 mm, significantly smaller than preceding Grand Seiko dive observe cases.

Besides water resistance, possibility of easy-reading is also a core requirement for dive watches. The ISO 6425 standard stipulates that ski watches must have continuous tiny markers, clearly legible five-minute interval markers, and lustrous reference markers (usually triangular) on the bezel to indicate immerse time. To meet these prerequisites, the new Spring Drive UFA Ushio 300 is equipped with some sort of unidirectional rotating bezel having 120 graduations for highly accurate adjustment and meets all of specified characteristics. The viser is inlaid with hard, available in blue or environment friendly depending on the version, ensuring the begining and corrosion resistance.

Possibility of easy-reading in low light conditions in addition meets ISO 6425 expectations: after exposure to light, this timepiece must be clearly readable at midnight from a distance of 25 cm. Therefore , the bezel guns, hands, and rectangular time markers of the new Spring Drive UFA Ushio 300 dive watch are lined with a large amount of green fluorescent material, Lumibrite. The watch dial continues the "Ushio" style and design theme that Grand Seiko dive watches have used due to the fact 2022, offering two pallettes: a blue dial denoting the deep ocean, as well as a green dial inspired by means of shallow waters. Both watches feature a gradient design, shifting from a darker tone close to the dial to a light tone at the center. An operating improvement is the power reserve pointer, which has been moved to the side with the dial.

Another key requirement of a dive watch is definitely corrosion resistance. According to ISO 6425 standards, corrosion battle is assessed through a sodium spray test; after 48 hours of exposure to deserving of spray, neither the watch themselves nor the strap really should exhibit any noticeable image or tactile changes. To meet up with this requirement, the new Spring Drive UFA Ushio 300 Diver watch features a scenario and strap made of "high-strength titanium, " a content that, according to the brand, is around 30% lighter than metal. The strap is equipped with a new newly developed folding hold with a safety mechanism in addition to an integrated micro-adjustment system. It offers three-stage adjustment about 6 mm, and can be extensive an additional 18 mm-for case in point, for wearing over a delving suit-for a total adjustment collection of up to 24 mm.

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