Grand Seiko Caliber 9SA5 Hi-Beat Automatic

Grand Seiko America will be closed November 11th in observance of Veterans Day. Any orders received before 2:30pm on Tuesday, November 10th will ship that day. Any orders received afterwards will be shipped on Thursday, November 12th when we resume operations.

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Caliber 9SA5

The Best Grand Seiko Mechanical Movement Ever Created

High-beat precision. Three-day performance. Crafted entirely in-house at the Grand Seiko Studio Shizukuishi.

Shop 9SA5 Watches Discover the Movement

36,000

Vibrations per hour

5 Hz for a smoother sweep and greater stability

Hour Power Reserve

Exceptional for a high-beat movement

+5 / −3

Seconds per day

Mean daily rate, tested across six positions

15%

Thinner

Than any previous Grand Seiko high-beat caliber

Born in Shizukuishi

Two decades after the first 9S, Grand Seiko pushed the boundaries again.

The goal: a 5 Hz movement with a dramatically longer power reserve. The result is Caliber 9SA5, designed, manufactured and adjusted by hand in the same studio where every Grand Seiko mechanical watch is made.

Hi-Beat 36000 · 80 Hours

SLGH031 White Birch

Ever Brilliant Steel · Micro-Adjustment Clasp

The white birch forests surrounding Grand Seiko Studio Shizukuishi. A richly textured dial inspired by their distinctive bark, powered by a movement that reflects the same natural beauty

USD

$10,200

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Inside Caliber 9SA5

Six innovations. One movement.

01 / Efficiency

Dual Impulse Escapement

Combines direct and indirect impulse to deliver power to the balance more efficiently. MEMS-made components solve the classic high-beat trade-off.

02 / Endurance

Twin Barrels, 80 Hours

Two mainspring barrels supply the torque for a large balance at 36,000 vph, plus more than three days of power reserve.

03 / Precision

The New Grand Seiko Overcoil

A hairspring curve refined through more than 80,000 simulations, optimized for accuracy in every position.

04 / Stability

Free-sprung Balance

No regulator. Four screws on the balance fine-tune the rate, protecting the hairspring and preserving precision over the long term.

05 / Detail

Instant Date Change

A tiny, complex MEMS-made date finger flips the date almost instantly, with precision worthy of the movement it serves.

06 / Comfort

Slimmer on the Wrist

0.8mm thinner than any previous Grand Seiko high-beat, with a lower crown position for a lower center of gravity and a closer fit.

A Work of Art

As beautiful as it is advanced.

The bridge traces the silhouette of Mt. Iwate and a bend in the Shizukuishi River that runs past the studio. Matte flanks absorb the light while sharply polished edges and screw holes sparkle, all visible through the caseback.

Evolution 9