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CALIBER 9F • HIGH-PRECISION QUARTZ • 高精度
QUARTZ
REDEFINED.
A movement conceived around a deceptively simple question: what makes an ideal watch? Caliber 9F answers with exceptional annual precision, decisive hand movement, durability and a construction designed to be serviced.
SECONDS PER YEAR
The quartz that behaves like a Grand Seiko.
Caliber 9F was created to solve three things at once: usability, legibility and ease of maintenance. It combines high precision with the torque needed for substantial Grand Seiko hands, a seconds hand that lands cleanly on its markers, and a protected movement architecture built to be serviced.
32,768 oscillations. Every second.
Quartz gives the watch its reference frequency. Tap the control to visualize the crystal starting to oscillate; the display slows the phenomenon dramatically so it can be seen.
Precision begins before the watch exists.
Grand Seiko grows its quartz crystals in-house, then artificially ages each selected crystal for 90 days under controlled temperature, humidity and high voltage. Its individual behavior is paired with an IC calibrated to that crystal.
Grow
Quartz crystals are produced in-house for tighter control over the raw timekeeping element.
Days of aging
Selected crystals are stabilized in controlled environmental conditions before installation.
Crystal + IC
The integrated circuit is tuned to the specific temperature characteristics of its individual crystal.
It checks the temperature 540 times a day.
Quartz frequency changes with temperature. Because every crystal responds a little differently, 9F samples temperature throughout the day and compensates through the movement’s IC.
At room temperature the model is near its reference point. Move farther away and the IC correction increases to counter the crystal’s temperature-dependent rate change.
Two pulses. One decisive step.
The Twin Pulse Control Motor produces the torque needed to move Grand Seiko’s large, heavy hands while keeping energy consumption low. The two pulse lines flash in sequence with every tick of the seconds hand.
Hitting the marker. Every time.
Every gear train needs a tiny amount of clearance between engaging teeth so the wheels can rotate smoothly. In a conventional quartz watch, that play can become visible at the dial: the seconds hand can recoil, shudder or settle slightly away from the marker. Grand Seiko considered that visual imprecision unacceptable—especially with the large, highly legible hands designed for Caliber 9F.
The hand advances once per second, then gives a clearly visible flutter as the gear train settles against the marker.
The 9F hand advances at exactly the same one-second cadence but stops cleanly on the marker without the visible flutter.
Open the case. Keep the movement protected.
Battery service can expose a quartz movement to dust and contamination. 9F’s protective shield construction covers the gear train to help keep contaminants away from the mechanism.
4,800 A/m between the outside world and precision.
A unique motor design using magnetic conductors, combined with an anti-magnetic iron plate, helps protect Caliber 9F against magnetic interference up to 4,800 A/m (60 G).
Within the rated protection range.
A year measured in seconds.
Caliber 9F is rated to ±10 seconds per year. Explore the maximum rated annual deviation across the year with a training visualization of how that specification accumulates over time.
This is a linear training visualization of the annual ±10-second specification, not a prediction of a particular watch’s actual rate.
Quartz — designed to be regulated.
Every 9F movement includes a regulation switch, a feature common in mechanical watchmaking but rarely found in quartz. It permits fine adjustment during service if needed.
Rotate the training knob to visualize fine rate correction. The exact service procedure is performed by trained watchmakers.
Precision you can see. Construction built to last.
9F is not simply an electronic timekeeper placed inside a Grand Seiko case. Its accuracy system, high-torque motor, backlash control, protective architecture, magnetic resistance and service regulation were developed as one complete movement philosophy. Each movement is hand-assembled by a skilled Grand Seiko watchmaker.