Watches and Wonders 2026: Grand Seiko shrinks its most precise diver

Smaller, sharper and more exact than ever. At Watches and Wonders Geneva, Grand Seiko presents a long-awaited update of its Spring Drive divers, now in a considerably more wearable format and with one of the most precise movements on the market. 

Grand Seiko’s earlier Spring Drive divers, such as the SLGA015 and SLGA023, have been technically impressive but also large – almost 44 mm in diameter. Now there is a clear change of course.

The new model measures:

• 40,8 mm in diameter
• 12,9 mm in thickness

The case and the bracelet are made in High-Intensity Titanium, which gives a light but robust feel on the wrist. This is without doubt one of the most wearable modern Grand Seiko divers so far – and something many enthusiasts have been asking for for a long time.

The dials come in blue and green and build further on Grand Seiko’s “Ushio” design, inspired by the movements of the tide. The fumé-like effect gives depth, while chunkier indices filled with Lumibrite improve legibility underwater.

The ceramic bezel with 120 clicks matches the darker tones of the dial and reinforces the overall visual impression.

U.F.A. – extreme precision

The real breakthrough sits on the inside. The new model is driven by the calibre 9RB1 UFA (Ultra Fine Accuracy) – a Spring Drive movement that sets a new standard for precision.

With an accuracy of ±20 seconds per year it is one of the most exact mechanically driven (but quartz-regulated) movements in the world.

The improved precision has also made it possible to reduce the size of the watch, without compromising on performance – something that has previously been a challenge for Spring Drive divers.

Grand Seiko have not only reduced the size – they have also improved the user experience:

• New bracelet with micro-adjustment in three steps (2 mm per step)
• Diver’s extension of 18 mm
• Solid case back for increased robustness

These are details that make a real difference in everyday life – especially for a watch that is actually meant to be used.

Grand Seiko shows craftsmanship at the highest level with the SBGZ011

In contrast to sporty divers and technical tool watches, Grand Seiko presents something completely different at Watches and Wonders Geneva. The SBGZ011 from the Masterpiece Collection is a poetic interpretation of time, where nature, craftsmanship and precision meet in one of the brand’s most advanced manual Spring Drive watches. The watch takes its aesthetic inspiration from the Tateshina waterfall in the Shinshu region – the same area where Grand Seiko’s exclusive Micro Artist Studio is based.
The result is a dial that does not just show time, but gives it shape. The hand-engraved lines run in several directions and create a sense of running water, a visual expression of the continuous flow of time. The SBGZ011 builds on the classic 44GS design, but here it is lifted to a new level. The case in platinum 950 is decorated with hand-engraved lines that mirror the flow of water on the dial.
Zaratsu polishing and brushed surfaces work together to create a play between light and shadow, something that changes depending on how the watch is worn. Beneath the surface sits the calibre 9R02, a manual Spring Drive movement developed by the Micro Artist Studio.

It offers:

• 84 hours of power reserve
• Dual-Spring Barrel
• Torque Return System

Here mechanical power is combined with quartz-regulated precision – but in a way that feels more like craftsmanship than technology.

The SBGZ011 is Grand Seiko at their most ambitious. This is not a watch that tries to be everything – it is one that focuses fully on craftsmanship, aesthetics and feeling.
It also shows why Grand Seiko holds a unique position in the watch world. Where Swiss manufacturers often lean on tradition, Grand Seiko builds further on nature, philosophy and Japanese craftsmanship.
This is less a watch – and more an object that measures the movement of time.