01 / DOUBLE BARREL
Wind the 80-hour reserve.
Press and hold the crown or drag the reserve control. The twin barrels charge together until the movement reaches its 80-hour power reserve.
9S MECHANICAL • 機械式
PRECISION
IN MOTION.
Grand Seiko mechanical watchmaking combines the latest technology with hand craftsmanship in a continuing pursuit of precision.
HI-BEAT9SA SERIES
36,000
VIBRATIONS PER HOUR
THE PURSUIT OF PRECISION • 精度
What makes 9S
Mechanical special?
The concept of Grand Seiko was born from the desire to build the world's best watch. As a true manufacture, Grand Seiko brings technology and hand craftsmanship together to push mechanical timekeeping forward.
01 / 04
First Grand Seiko
First Grand Seiko
Mechanical Movement
1960 marks the beginning of Grand Seiko mechanical watchmaking and the pursuit of a higher standard of precision.
9SA MECHANICAL HI-BEAT • 36,000 VPH
Four innovations.
One new architecture.
The 9SA series reimagines Grand Seiko's mechanical Hi-Beat movement with a thinner profile, extended power reserve, a new escapement and a free-sprung balance.
DOUBLE BARREL
Two barrels work together to deliver an 80-hour power reserve.
INTERACTIVE MECHANICAL LAB • 体験
Learn it by
doing it.
Two hands-on experiments turn the power reserve and energy flow of 9SA into something you can manipulate.
02 / ENERGY PATH / DUAL IMPULSE
Follow the energy.
Switch between a conventional conceptual path and the 9SA Dual Impulse concept. The visualization emphasizes how energy transfer can be made more direct.
Conceptual visualization — not a measured efficiency comparison.
BARRELGEAR TRAINESCAPEMENTBALANCE
MORE DIRECT ENERGY TRANSFERHIGH FREQUENCY • 高振動
See the difference
in the sweep.
Both seconds hands complete one full revolution every 60 seconds. At 36,000 vph, the hand advances 10 times per second; at 28,800 vph, it advances 8 times per second.
36,000VPH
60 seconds / revolution • 36,000 VPH = 10 ticks/sec • 28,800 VPH = 8 ticks/sec
STABILITY IN MOTION • 安定性
Shake the
difference.
A higher-frequency balance is less affected by disturbance. Shake your phone and compare how quickly each system recovers.
Tap Enable Motion, then shake your phone.
Interactive visualization — response is exaggerated to demonstrate relative stability. VPH describes balance oscillation frequency, not continuous wheel RPM.
INTERACTIVE MECHANICAL LAB • 体験
Learn it by
doing it.
Three hands-on experiments let you assemble the architecture, visualize accumulated accuracy and regulate the rate to Grand Seiko Standard.
01 / ARCHITECTURE
Build the movement.
Tap the components in the order mechanical energy travels through the caliber. Complete the chain from stored energy to regulation.
Start with the barrel.
02 / ACCURACY
Watch seconds accumulate.
Set a daily deviation within the Grand Seiko Standard of −3/+5 seconds per day, then move through time to see how a tiny daily difference accumulates.
+17.0SECONDS TOTAL
03 / REGULATION
Can you regulate it?
Your watch starts outside the Grand Seiko Standard. Adjust the rate until you bring it inside the −3/+5 seconds-per-day window.
−150+15
+12.0SEC / DAYOUTSIDE GS STANDARD
Target: −3 to +5 sec/dayHOW A MECHANICAL MOVEMENT WORKS • 機構
Inside the movement.
Component by component.
MECHANICAL ENERGY • 仕組み
How a mechanical
movement works.
Follow the path of energy from the wound mainspring through the gear train, escapement and regulation system.
M.E.M.S. • MICRO ELECTRO-MECHANICAL SYSTEMS
Intricate by design.
Lighter by technology.
Grand Seiko's escape wheel and lever are manufactured using MEMS technology. The process enables lighter components and greater lubrication retention to support durability.
5%
Escape Wheel
Lighter than conventional counterparts, according to the training sheet.
25%
Lever
Lighter, while MEMS permits an intricate component design.
LUBRICATION RETENTION
Designed for durability.
MEMS makes greater lubrication retention possible, helping increase durability over time.
9S MECHANICAL • BENEFITS
Built around
precision & stability.
Seconds per day
High precision standard stated on the 2026 9S training sheet.
Vibrations per hour
High frequency supports greater stability of accuracy and a smoother seconds-hand sweep.
Days of testing
Grand Seiko Standard testing is described as exceeding chronometer specifications.
Crafted & adjusted
Mechanical calibers are crafted and adjusted by highly skilled craftspeople.
GRAND SEIKO STANDARD • 検査
A more demanding
testing standard.
The 2026 training sheet compares Grand Seiko Standard testing with chronometer testing across position, duration, daily rate and temperature testing.
TESTGRAND SEIKO STANDARDCHRONOMETER
POSITIONS6VS5
TEST DURATION17 DAYSVS15 DAYS
DAILY RATE-3 TO +5 SEC/DAYVS-4 TO +6 SEC/DAY
TEMPERATURESECONDARY TESTVSNONE
9S MECHANICAL • GRAND SEIKO
Technology advances.
Craft remains human.
Use the original 2026 9S sheet as the quick-reference companion to this interactive module.