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Caliber 9SA4
The Ultimate Hand-Winding Experience
Grand Seiko’s first new manual-winding 36,000 vph movement in more than 50 years, created for the pleasure of winding.
Shop 9SA4 Watches Discover the Movement
36,000
Vibrations per hour
5 Hz for rate stability and higher precision
80
Hour Power Reserve
From a single full wind
50+
Years
Since Grand Seiko last introduced a hand-wound high-beat movement
40%
Redesigned
Nearly 40 percent of the base movement, rebuilt around the winding experience
The Ritual of Winding
Every turn of the crown, felt and heard.
Nearly 40 percent of the base movement was redesigned for the senses. The click and click spring are tuned for their feel and sound, the crown stops when the mainsprings are fully wound, and a power-reserve indicator on the bridge shows the state of wind at a glance.
Caliber 9SA4 in Motion
See the movement at work.
Manual Hi-Beat 36000 80 Hours SLGW003
Manual Hi-Beat 36000 · 80 Hours
SLGW003 Birch Bark
38.6mm Brilliant Hard Titanium · 9.95mm thin
A dial textured like the bark of the birch trees around Studio Shizukuishi, in a slim, light titanium case made for a hand-wound dress watch.
USD
$11,600
Learn More
Inside Caliber 9SA4
Built around the winding experience.
01 / Nature
The Wagtail Click
The click takes the shape of a wagtail, a bird special to nearby Morioka. Its pecking motion is visible through the caseback as you wind.
02 / Feel
Tuned for the Hand
The click and click spring are tailored for their feel and sound, and the crown stops when the movement is fully wound.
03 / Endurance
Dual Impulse and Twin Barrels
The same efficient escapement and twin barrels as Caliber 9SA5 deliver 80 hours of power at 36,000 vph.
04 / Precision
Free-sprung Balance and Overcoil
Rate stability and resistance to outside interference, the qualities that have long defined Grand Seiko high-beat movements.
05 / Standard
17 Days of Testing
Every 9SA4 is tested in six positions at three temperatures over 17 days to meet the Grand Seiko Standard.
Evolution 9
Powered by 9SA4
Manual Hi-Beat 36000 80 Hours SLGW003
Manual Hi-Beat 36000 · 80 Hours
Birch Bark
SLGW003 · Brilliant Hard Titanium
The textured bark of the birch forests around Studio Shizukuishi, in a light titanium case.
USD
$11,600
Learn More
Manual Hi-Beat 36000 80 Hours SLGW007
Manual Hi-Beat 36000 · 80 Hours
Moonlit Birch
SLGW007 · Stainless Steel
Birch bark under moonlight in a textured navy dial.
USD
$10,000
Learn More
View All 9SA4 Models
Specifications
Caliber 9SA4
Hi-Beat 36000 · Manual-winding · 80 Hours
Winding mechanism
Manual winding
Vibrations
36,000 per hour (5 Hz)
Power reserve
Approx. 80 hours
Mean daily rate*
+5 to −3 seconds per day
Normal usage accuracy
+8 to −1 seconds per day
Jewels
47
Features
Power-reserve indicator · Hacking
*Mean value of daily rates measured in six positions over 12 days, before casing, under controlled conditions.
Grand Seiko Studio Shizukuishi
Wind it yourself. Feel the difference.
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