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Precision and simplicity form the very essence of the ideal timepiece, allowing it to fulfill a lifetime of commitment to its wearer. 9F was the first quartz movement to achieve this fundamental ideal.

The Instant Date Change Mechanism changes the date display in the blink of an eye.
Torque comparable to that of a mechanical movement makes the iconic wide hands of Grand Seiko possible.
Improved second hand precision achieves greater positional accuracy on the dial against the markers.
The sealed structure improves retention of lubricating oils.

Caliber 9F redefines the quartz watch, delivering higher performance and greater durability. It is the quartz watch that merits the name Grand Seiko.


A quartz movement depends on a battery as a power source. The battery sends electricity to a quartz oscillator, which vibrates at precisely 32,768 times per second. An integrated circuit (IC) detects these vibrations and sends out an accurate time signal every second to the step motor. The step motor activates in accordance with this time signal, accurately rotating a series of gears and the watch hands.


Changing the date display in the blink of an eye.

The 9F quartz movement utilizes a cam and lever in conjunction with the date indicator driving wheel as part of a feature known as the Instant Date Change Mechanism.

Through this mechanism, the date indicator driving wheel builds tension in the lever spring as it rotates, eventually releasing the stored energy when it reaches the location of the cam and driving the calendar wheel forward in the blink of an eye.

While some mechanical movements possess enough torque to deliver instant date changes, Grand Seiko was the first to pioneer the mechanism in a quartz movement.

The task of aligning the Instant Date Change Mechanism to occur precisely at midnight falls upon Seiko's skilled craftsmen, who painstakingly set the mechanism by hand. In order to ensure that there is no situation in which the change occurs prematurely, the mechanism is set to activate within five minutes after midnight.


A quartz movement crafted by hand

While the majority of the world's quartz movements are products of automatic assembly, Grand Seiko's 9F quartz movement, with its variety of complex functions, is assembled entirely by hand. Two expert craftsmen combine their individual talents to preserve the high quality standard of Grand Seiko – with one assembling the date indicator and the other in charge of the movement.


Assembly and Adjustment

Once the movement is assembled, the dial, markers and hands are attached and the entire movement installed into the case. Attaching the watch hands is perhaps one of the most delicate and precise procedures requiring the supreme skill of an experienced craftsman or woman.

The hour and minute hands are stacked in parallel within a space of just 2mm and fixed in place with the movement axis by frictional force. Only an expert in adjustment can ensure that all hands, a mere 0.2mm apart, operate smoothly without colliding with one another as they rotate.

In order to ensure that no damage is wrought to the hands during assembly, craftsmen polish the tips of their pincers multiple times every day. It is the cumulative efforts of these painstaking details which have raised Grand Seiko to become the standard bearer it is today.


Adjustment to your environment


Regulation switching for precision control in a quartz movement

While mechanical watches possess a mechanism for fine tuning precision, these controls are impossible in most quartz watches.

The 9F quartz movement, however, features a regulation switch that makes such precision control possible. If, because of environmental conditions or other factors, a watch ever becomes too fast or slow, the switch can be used to correct for such divergences. Owners who come to intimately know the individual tendencies of their watch over the years can quickly adjust the accuracy and continue to use it for years to come.

Given the superb inherent accuracy of the 9F quartz movement, however, most will never need to know this adjustment function even exists. This is true to the high standards of Grand Seiko.


Grand Seiko began its long history in 1960 with mechanical watches. In 1988, the first quartz Grand Seiko model was born, with a powerful movement with an accuracy rate of ±10 seconds a year. In 1993, Grand Seiko achieved a new standard in quartz watches with the release of the 9F8 series which incorporated new features including the Backlash Auto-Adjust Mechanism, the Twin Pulse Control Motor, and the Instant Date Change Mechanism.



MovementAccuracyBattery lifeFeatures
Caliber 9F86±10 seconds per yearApproximately 3 years-Instant date change mechanism
-Dual time function with 24-hour hand
-Quick correction function of time difference adjusting to a calendar
Caliber 9F85±10 seconds per yearApproximately 3 years-Instant date change mechanism
-Quick correction function of time difference adjusting to a calendar
Caliber 9F62±10 seconds per yearApproximately 3 years-Instant date change mechanism


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