Collaboration of Spring IC

Moves the needle with a force of spring to get coming loose, 

while controlling the accuracy by IC and crystal oscillator, 

that is a mechanism of originality unparalleled in the world, 

so called Spring Drive.

It is an innovative mechanism of Seiko original 

that combines both the taste of mechanical watch 

and the technology of microelectronics. 

Spring Drive to assume the natural movement 

of people to use as a power source is the watch which connected 

with the person to use and the most advanced technology closely related each other.

Machine and Human collaboration

While it may be said it cannot be made by machine, 

a machine may be necessary eventually. 

For example, gear. 

In order to make a high-accurate mechanical movement, 

you need to refine the gear to polish thoroughly. 

To increase the processing accuracy thoroughly 

by mechanical engineering evolved in the modern part, 

it is polished carefully one by one by the hand of craftsman. 

An advanced technology and a traditional craftsmanship. 

Unless the both get together, 9S mechanical movement can not be made.

There is a thing that cannot be made by machine.

Hairspring attached to the balance 

which controls the accuracy of mechanical movement 

can be adjusted carefully at the micro level. 

Because the power adjustment is too delicate, 

a machine cannot do it. 

A craftsman adjusts it using handmade tweezers

Fine-tuning of accuracy

Mechanical watch has a mechanism to fine-tune accuracy,

but quartz watch can not generally fine-tune accuracy. 

However, 9F quartz of Grand Seiko can fine-tune accuracy by the switch.

Some years later after applying,

when it became clear in tendency whether it is likely to be fast or late, 

the accuracy can be compensated by the switch. 

When you use it regularly for a long period, 

you understand the "peculiarity" of the watch  

and can make adjustment to fit the "peculiarity.".

Aging for 3 months.

Quartz crystal used in quartz watches vibrates 32,768 times per second 

and the accuracy of quartz watches is determined depending 

on whether can keep this frequency. However,

there are individual differences in crystal oscillator, 

and some might not keep the frequency stable due to changes 

in the environment. With the quartz watch of Grand Seiko, 

are adopted only ones which cleared eventually 

the standard  after a three month long aging process.

“Accurate” Watch

Not to mention such excellent specification 

as less than 10 seconds of yearly deviation, 

but it can not express Grand Seiko just with mere specification.

Even movement with a high degree of accuracy, 

it can not read the exact time by a short hand. 

In quartz watch, a second hand moving 

only one scale per second does not point exactly to the scale, 

it would not be called "accurate watch" Long thick hand. 

Second hand of 9F quartz, moves accurately without trembling.

Index that has been polished. 

Not be expressed only by a number of specification, 

that is also represented by the discovery in Grand Seiko 

which can be realized only after using.

Beautifully shining watch

In the late 1960s, Grand Seiko established “Seiko style" 

in a molding that maximizes the beauty of Zaratsu polishing 

to finish like a mirror polished surface mainly of plane. 

With the design of Grand Seiko it realized "Seiko Style", 

by performing more than 50 of polishing to pull beautifully shining suitable 

for Grand Seiko out of the metal.