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Caliber 9S65


Caliber 9S65

Caliber 9S65 is the most standard automatic movement that typifies the 9S mechanical series. The old and new movements may appear to have a similar design, but they are utterly different in terms of performance.

Grand Seiko has not only revised the materials used to make this movement, but also applied MEMS (Micro Electro Mechanical System) technology, which utilizes semi-conductor manufacturing technology, to the production of the watch parts. Seiko has significantly enhanced the basic performance of this timepiece, and has also redesigned the way in which the rotor winds the mainspring.
The winding system of its predecessor, Caliber 9S55, used Grand Seiko's Magic Lever mechanism. By contrast, Caliber 9S65 uses a standard reverser gear train system. Hardening the components has helped improve the durability of the reverser system, which had been a weakness. Miniaturizing the components has succeeded in improving its efficiency.

The balance staff has also been improved. The previous balance pivot had a shaft tip diameter of 0.07 mm, but this has been increased to 0.08 mm on the 9S65. Even though the difference in diameter is only 0.01, the thicker tip has greatly increased the movement's shock resistance.

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

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.