Evolution 9
Hi-Beat 36000 Self-winding 80 Hours
SLGH035
Evolution 9
Hi-Beat 36000 Self-winding 80 Hours
SLGH035
A dial that expresses the magnificent scenery of the Genbi Valley
The Iwai River, which flows from its source on the northern slope of Mt. Kurikoma, eroded massive stones to shape the terrain and create waterfalls and ravines. This resulted in the Genbi Valley’s natural beauty. Its impressive scenery is celebrated through a designation as a Place of Scenic Beauty for Japan. This beauty inspired the pressed pattern dial with light-blue color, whose expressions are ever-changing depending on the angle of the light.
Caliber 9SA5
Thanks to the highly efficient Dual Impulse Escapement and twin barrels, Caliber 9SA5 achieves approximately 80 hours of power reserve when fully wound, even with its high frequency of 36,000 vibrations per hour. The mechanical movement also allows the watches it powers to be lighter, through a unique horizontal ring construction.
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 that expresses the magnificent scenery of the Genbi Valley
The Iwai River, which flows from its source on the northern slope of Mt. Kurikoma, eroded massive stones to shape the terrain and create waterfalls and ravines. This resulted in the Genbi Valley’s natural beauty. Its impressive scenery is celebrated through a designation as a Place of Scenic Beauty for Japan. This beauty inspired the pressed pattern dial with light-blue color, whose expressions are ever-changing depending on the angle of the light.
Caliber 9SA5
Thanks to the highly efficient Dual Impulse Escapement and twin barrels, Caliber 9SA5 achieves approximately 80 hours of power reserve when fully wound, even with its high frequency of 36,000 vibrations per hour. The mechanical movement also allows the watches it powers to be lighter, through a unique horizontal ring construction.
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 high-beat mechanical watch capturing the refreshing scenery of Japan’s Genbi Valley
Japan’s lush Genbi Valley has been designated as a Place of Scenic Beauty and Natural Monument. This scenic gorge can be found mid-stream on the Iwai River in Iwate Prefecture, where expert craftspeople create Grand Seiko’s mechanical watches. The Genbi Valley’s flowing water in early summer is expressed through a unique pressed-pattern dial in light blue.
Inside is the mechanical high-beat Caliber 9SA5, a Grand Seiko-exclusive self-winding movement. Thanks to the Dual Impulse Escapement and twin barrels, this mechanical movement achieves a high frequency of 36,000 vibrations per hour while offering an impressive power reserve of approximately 80 hours when fully wound. The watch’s case and bracelet are created from Ever-Brilliant Steel, a stainless-steel alloy renowned for its exceptional corrosion resistance and bright hue.
Exterior
Functions
- Screw-down crown
Movement
Mean daily rate is a mean value of daily rates in a condition where the movement before assembly in a case is measured in six positions in a fixed manner under artificially controlled environment for 12 days.
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