Evolution 9
Spring Drive U.F.A. Self-winding
SLGB011
Evolution 9
Spring Drive U.F.A. Self-winding
SLGB011
A dial representing the flow of time through the valley
The Atera Valley is one of the foremost places of scenic beauty in Nagano Prefecture. As the vibrant natural environment changes in expression throughout the four seasons, it enchants the hearts of all who visit. Through a beautiful gradation, this watch expresses the eternal flow of time evident in the formation of the valley.
Caliber 9RB2
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 exceptional annual rate of ±20 seconds, or approximately ±3 seconds per month.
Ever-Brilliant Steel with superior corrosion resistance
Known as Ever-Brilliant Steel due to its brilliant white hue, this special alloy is more resistant to corrosion than the stainless steels used in even the most prestigious watches today. It has a PREN (Pitting Resistance Equivalent Number) of over 40. PREN is a widely accepted standard used to measure corrosion resistance.
A dial representing the flow of time through the valley
The Atera Valley is one of the foremost places of scenic beauty in Nagano Prefecture. As the vibrant natural environment changes in expression throughout the four seasons, it enchants the hearts of all who visit. Through a beautiful gradation, this watch expresses the eternal flow of time evident in the formation of the valley.
Caliber 9RB2
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 exceptional annual rate of ±20 seconds, or approximately ±3 seconds per month.
Ever-Brilliant Steel with superior corrosion resistance
Known as Ever-Brilliant Steel due to its brilliant white hue, this special alloy is more resistant to corrosion than the stainless steels used in even the most prestigious watches today. It has a PREN (Pitting Resistance Equivalent Number) of over 40. PREN is a widely accepted standard used to measure corrosion resistance.




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A Spring Drive U.F.A. creation with a dial depicting the beautiful Atera Valley in all its blue-green glory
Nagano Prefecture is home to a number of mountains rising over 3,000 meters. The countless rivers that flow from these mountains have, over many years, created a lush, natural environment. The watch’s dial captures the enchanting scenery of the Atera River near the Shinshu Watch Studio, located within a Seiko facility in Shiojiri, home of Grand Seiko Spring Drive watchmaking. The dial’s intricate gradation and blue-green 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. It also features a power reserve of approximately 72 hours (about three days) when fully wound. The case and bracelet feature Ever-Brilliant Steel, a stainless-steel alloy renowned for its exceptional corrosion resistance and bright hue.
Exterior
Functions
- Screw-down crown
- 34 jewels
- Power reserve indicator
Movement
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