Grand Seiko arrived in Geneva this April with two releases that define the brand’s 2026 ambitions with unusual precision. On one side, the Spring Drive U.F.A. platform takes its first plunge into the diving category with a High-Intensity Titanium pair. On the other, the Micro Artist Studio in Shiojiri delivers one of its most involved Masterpiece pieces to date, hand-engraved in platinum and limited to 50 examples. Both watches speak the same Grand Seiko language, though in very different registers.
Spring Drive U.F.A. Ushio 300 Diver – SLGB023 / SLGB025
The Ushio design has shaped Grand Seiko‘s diver aesthetic since 2022, and the two new variants bring that language to its sharpest expression yet. The word ushio means “tide” in Japanese, and both dials use a gradient to animate the wave pattern rather than compete with it.
The blue SLGB023 captures the quality of light descending into deep ocean water, and the green SLGB025 draws from the calmer surface of shallow coastal waters near the shore. Both the hour and minute hands keep a sharply defined, powerful profile, and the multi-faceted Evolution 9 indexes use diamond-cut edges and sides to maximise brilliance, with rectangular forms that hold enough Lumibrite for dependable legibility in any light.
Caliber 9RB1 carries the U.F.A. designation, which Grand Seiko introduced at Watches and Wonders 2025, and the Shinshu Watch Studio in Shiojiri hand-assembles every single example. The movement reaches an annual accuracy of plus or minus 20 seconds, a figure that, as of April 2026, makes it the most accurate mainspring-powered wristwatch movement available. Grand Seiko achieves this by vacuum sealing the crystal oscillator alongside the IC after a three-month ageing process, then measuring each oscillator at multiple temperatures and programming the resulting data into a low-power IC for precise thermo-compensation. A regulation switch further allows corrections during after-sales service. The 9RB1 measures 30.0mm in diameter and 4.7mm thick, stores a 72-hour power reserve, and runs through 33 jewels.
High-Intensity Titanium covers both the case and bracelet, approximately 30% lighter than stainless steel and with a notably brighter tone. The compact 9RB1 makes a case diameter of 40.8mm possible, the smallest Grand Seiko has ever produced for a diver, at 12.9mm thick. A 120-click unidirectional bezel with a ceramic insert handles precision adjustment, and the screw-down crown and screw caseback take water resistance to 300 metres. Grand Seiko designs the broad lugs to capture light across a wide surface, reinforcing the presence on the wrist despite the compact footprint. The bracelet connects to a newly developed locking extension clasp that delivers three-step micro-adjustment up to 6mm plus 18mm of extension for diving suit use, totalling 24mm of overall range. Both references carry a European retail price of EUR 12,500 each and reach boutiques and select retailers from June 2026.
Ref. SBGZ011 – Mystic Waterfall, Masterpiece Collection
The Tateshina Waterfall flows through the primeval forest of Shinshu, and the Micro Artist Studio translates its character directly onto the dial. Every line on the SBGZ011’s dial comes from hand engraving, with craftspeople running those lines in multiple directions until they converge into the flowing image of spring water rising from the earth.
The lettering and minute markers are carved into the dial rather than applied, lending the surface genuine depth and dimensionality. The hour and minute hands and each applied marker use 14k white gold with diamond-cut finishing, and artisans curve the minute and seconds hands gently by hand toward the dial. The tempered gray Spring Drive seconds hand glides across the engraved surface with the characteristic Spring Drive sweep, and a star mark at six o’clock identifies the solid gold hour markers.
Caliber 9R02 from the Micro Artist Studio measures just 4.0mm in thickness, making it Grand Seiko‘s thinnest Spring Drive movement to date. It achieves an 84-hour power reserve by combining a Dual Spring Barrel (two mainsprings set in parallel within a single barrel) with the Torque Return System, which recaptures approximately 30% of peak torque that a conventional movement wastes and redirects it to rewind the mainspring. Accuracy sits at plus or minus 15 seconds per month, or approximately plus or minus 1 second per day, across 39 jewels. The two hand-finished bridges carry high-polished edges achievable only by hand, set against fine straight graining across the bridge surfaces. The barrel features a hand-engraved bellflower, the civic symbol of Shiojiri, and an 18k gold plaque on the lower bridge reads “Micro Artist,” open to personal customisation from the owner.
Platinum 950 forms the 44GS case, which Grand Seiko keeps to a profile of just 9.6mm, matching the original 44GS of 1967. The case measures 40.0mm in diameter, and countless hand-engraved lines flow from the dial across the case surfaces, following the sharp ridgelines that define 44GS architecture. Zaratsu polishing and brushed finishing work in concert with the engraved surfaces to shift the interplay of light and shadow at every angle. Two straps ship with the piece: a glazed black crocodile leather strap with a Platinum 950 and 18k white gold clasp, and a KYOTO Leather strap that weaves Nishijin technique and gold leaf craft from Kyoto together with Himeji tannery leather. Grand Seiko limits this creation to 50 examples, exclusively through Grand Seiko Boutiques from July 2026, priced at EUR 86,000.
A Clear Statement
Grand Seiko’s 2026 Watches and Wonders presentation maps neatly onto two distinct convictions. The Ushio 300 Diver confirms that the U.F.A. platform is now robust enough to operate 300 metres underwater in titanium at a price point that, given the technology involved, feels genuinely reasonable. The SBGZ011 Mystic Waterfall argues the opposite case: that a machine will never replicate what the Micro Artist Studio does by hand in Shiojiri, and that fifty collectors now have the rare opportunity to discover this for themselves.
