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Evolution 9 Collection

Spring Drive U.F.A.

SLGB003

The most accurate Spring Drive movement ever, paired with a dial inspired by the beauty of ice forests.

FEATURES

This model features a case that embodies the “Evolution 9 Style,” a step forward for Grand Seiko’s iconic design language, the Grand Seiko Style. Its dial captures the enchanting scenery of ice forests that appear during the harsh winter near the Shinshu Watch Studio, located within a Seiko Epson facility in Shiojiri, home of Grand Seiko Spring Drive watchmaking. The intricate dial pattern and coloring express this natural phenomenon with refined craftsmanship.
The watch is equipped with the Spring Drive U.F.A. Caliber 9RB2, which delivers an extraordinary annual accuracy of ±20 seconds, making it the most accurate wristwatch movement powered by a mainspring today.* It also features a power reserve of approximately 72 hours (about three days) when fully wound.
The case and bracelet are made of High-Intensity Titanium, which is about 30% lighter than stainless steel and offers superior scratch and corrosion resistance, ensuring a light and comfortable wearability.
*As of April 2025, based on Grand Seiko’s research.

Specifications

Exterior
Exterior: High-Intensity Titanium
Case back: See through Screw Back
Glass Material: Box shaped sapphire crystal
Glass Coating: Anti-reflective coating on inner surface
Case size: Diameter 37.0mm Lug-to-lug 44.3mm Thickness 11.4mm
Band width: 20mm
Clasp type: Micro-adjustment clasp
The perimeter of Band: 195mm
Movement
Caliber no.: 9RB2 Instructions
Movement Type: Spring Drive
Power reserve: Approx. 72 hours(3 days)
Accuracy: ±20 seconds per year (±3 seconds per month)
Functions
Water resistance: 10 bar
Magnetic resistance: 4,800 A/m
Other details / Features:
  • Screw-down crown
  • Allergy-safe metal
  • 34 jewels
  • Power reserve indicator

The most compact 9R Spring Drive watch

The Evolution 9 Style represents the essence of Grand Seiko’s design philosophy, harmoniously blending Japanese aesthetics with refined craftsmanship. While adhering to this foundational design language, this model achieves the most compact dimensions of any 9R Spring Drive-powered watch, with a case diameter of 37 mm and a case length of 44.3 mm. Despite its comfortable size, the open dial and wide bracelet create a strong presence on the wrist.

Details of Evolution 9 Style

Astonishing accuracy

The new movement achieves its ±20-seconds-per-year accuracy thanks to new and enhanced manufacturing and processing methods for the three-month-aged quartz oscillator, and a newly designed IC. And, as with the 9RA series of Spring Drive movements, the frequency of each individual quartz oscillator is measured at several different temperatures, with the resulting data necessary for thermo-compensation programmed into the low-power IC. Both the oscillator and sensor are vacuum-sealed to minimize temperature differences and protect against external factors such as humidity, static electricity, and light, ensuring precise temperature adjustments and the stable performance of the quartz oscillator. In addition, for the first time in Spring Drive, the new movement features a regulation switch that can be used during after-sales service to correct any divergences in accuracy that may occur over long periods of use.

Dial pattern that embodies the caliber beneath it

Caliber 9RB2 was developed over eight years, enduring many winters before its completion. A dial pattern inspired by ice forests was created to express the identity of this movement, portraying the mystical ice-covered forests that represent the harsh winters of the Shinshu region. The dial features a finely detailed linear motif layered with a delicate silvery-white tone, evoking the image of ice forests sparkling in sunlight as they sway in the freezing wind. This poetic design harmonizes with the remarkable precision of the Spring Drive U.F.A.

Newly developed three-step micro-adjustment clasp

It features a newly developed three-step micro-adjustment clasp that operates without a tool, allowing precise adjustments in 2mm increments for enhanced comfort.

Details

Finishing that reflects the natural beauty of Shinshu

The movement's beauty is revealed through the sapphire crystal case back, with mirror-polished, beveled edges adding brilliance. Its design, inspired by the natural surroundings of the Shinshu Watch Studio where it is made, reflects a uniquely Japanese aesthetic characterized by understated charm and elegance. The jewels echo the glittering stars that sparkle during the early days of winter above the surrounding mountains, and the delicate texture of the movement’s surfaces reflects the frost that winter brings to the trees of Shinshu, where all Grand Seiko Spring Drive watches are made.

A movement with an astounding annual rate

The pursuit of high accuracy has always been the cornerstone of Grand Seiko’s values. Receiving the new U.F.A. designation, which stands for “Ultra Fine Accuracy,” Caliber 9RB2 boasts a level of precision defined not by accuracy in seconds per day, week, or month, but by accuracy over one year. The movement has an astounding annual rate of ±20 seconds, or approximately ±3 seconds per month.

Details of Caliber 9RB2

　
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