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9S MECHANICAL MOVEMENT

AUTOMATIC 3-DAY POWER RESERVE GMT

Caliber 9S66

AUTOMATIC 3-DAY POWER RESERVE GMT

Caliber 9S66

Caliber 9S66 has all the performance of the most standard automatic movement of the 9S mechanical models — Caliber 9S65 — but comes with the addition of the GMT function.

Pulling the crown out by one notch enables the hour hand to be adjusted without stopping the second hand so that the highly accurate timekeeping delivered by the Hi-Beat 36000 is not lost.
The watch is the embodiment of the Grand Seiko pursuit of high accuracy, maintaining exceptional precision in both the essential time display and the GMT function.

SPECIFICATIONS
Driving system Automatic with manual winding mechanism
Accuracy +5 to -3 seconds per day (under a static use)

Note: This accuracy is the result of measuring the loss/gain of the time for seventeen days before the inside movements of the watch are put in the case. The measurement has been done in the factory where temperatures or position of the movements are controlled.

Actually worn from +10 second/day to -1 seconds/day
Power reserve Approximately 72 hours
Vibrations 28,800 vibrations per hour (8 beats per second)
Jewels 35 jewels
Remarks Dual time function with 24-hour display

What makes 9S special?

Every one of the 200 or more components in a mechanical watch are critical to its performance and durability but none more so than those that make up the regulator and escapement mechanisms.
When the 9S caliber was designed, these were engineered anew. With the subsequent creation of the 9S85 Hi-beat caliber, new materials and new manufacturing techniques were used, further enhancing the performance of these key parts and these latest materials and techniques are now incorporated in all 9S movements, greatly increasing both their power reserve and their precision.

Several of these high-precision components are manufactured to an accuracy of one thousand of a millimeter. Such precision and the use of MEMS manufacturing for the pallet fork and escape wheel make a vital contribution to what makes Grand Seiko’s 9S calibers special, but these remarkable achievements count for little without the skill of Grand Seiko’s craftsmen and women to realize the lasting performance for which Grand Seiko is renowned. Their ability to assemble and adjust each 9S watch is the final, crucial element. Only when their work, and the 17 day testing program to which each watch is subjected, is over can the stringent ‘New GS’ standard be met and the watch’s Grand Seiko certificate issued.
Precision, craftsmanship and innovation all play their part, but, in the final analysis, what makes the 9S family of mechanical movements so special is that all stages, from the design of the movement and parts manufacture to assembly and adjustment are carried out in-house by Grand Seiko’s own watchmakers. For over 60 years, it’s been the same. It’s our people that make the 9S special.

LEARN MORE ABOUT 9S MECHANICAL MOVEMENT
CALIBER 9S66 MODELS

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