9S Mechanical
The concept of Grand Seiko was born from the desire to build the world's best watch, and the collection continues to push precision in mechanical watches to the limits of timekeeping technology.
As a true manufacture, Grand Seiko incorporates the latest technology alongside its breadth of craftsmanship to raise the art of watchmaking to its peak.
With anywhere between 200 and 300 individual parts, mechanical watches must exhibit a near-perfect consistency of functionality in the detail of these parts to ensure the precision of the movement. Seiko employs Micro Electro Mechanical Systems (MEMS) technology in the manufacturing of its escapements, bringing the mechanical accuracy of its parts to the forefront of technology.
Mere parts alone, however, cannot constitute the level of precision for which Grand Seiko is renowned.
The task of assembling Grand Seiko is borne by craftsmen and women who have honed their craft to such an extent that they can adjust parts by hand to tolerances of one hundredth of a millimeter. This extremely detailed craftsmanship is what has made possible the very precise timekeeping delivered by the 9S mechanical movement.
History
Pursuing an ideal, since 1960.
From the very start, a precise perspective on time.
On December 18, 1960, the first Grand Seiko watch was unveiled. It expressed Grand Seiko’s commitment to the ultimate in precision, beauty and durability, ideals that still define Grand
9S Mechanical Movement
Movement Comparison
| Movement | Mean daily rate*1 | Normal usage accuracy | Power reserve | Vibrations | Number of jewels | Features |
|---|---|---|---|---|---|---|
| Manual-winding Mechanical Hi-Beat 36000 80 Hours Caliber 9SA4 (Manual winding mechanical) |
+5 to -3 seconds per day | +8 to -1 seconds per day | Approximately 80 hours | 36,000 vibrations per hour (10 beats per second) | 47 jewels | · Dual Impulse Escapement
· Twin barrels · Power reserve indicator |
| Hi-Beat 36000 3-Day Chronograph Caliber 9SC5 (Automatic with manual winding) |
+5 to -3 seconds per day | +8 to -1 seconds per day | Approximately 72 hours | 36,000 vibrations per hour (10 beats per second) | 60 jewels | -Chronograph
-Dual Impulse Escapement -Twin barrels |
| Hi-Beat 36000 80 Hours Caliber 9SA5 (Automatic with manual winding ) |
+5 to -3 seconds per day | +8 to -1 seconds per day | Approximately 80 hours | 36,000 vibrations per hour (10 beats per second) | 47 jewels | -Dual Impulse Escapement
-Twin barrels -Instant date change mechanism |
| Mechanical Hi-Beat 36000 GMT Caliber 9S86 (Automatic with manual winding mechanism) |
+5 to -3 seconds per day | +8 to -1 seconds per day | Approximately 55 hours | 36,000 vibrations per hour (10 beats per second) | 37 jewels | -Dual time function with 24-hour hand
-Quick correction function of time difference adjusting to a calendar |
| Mechanical Hi-Beat 36000 Caliber 9S85 (Automatic with manual winding mechanism) |
+5 to -3 seconds per day | +8 to -1 seconds per day | Approximately 55 hours | 36,000 vibrations per hour (10 beats per second) | 37 jewels | -Date display |
| Automatic 3-Day Power Reserve Caliber 9S68 (Automatic with manual winding mechanism) |
+5 to -3 seconds per day | +10 to -1 seconds per day | Approximately 72 hours | 28,800 vibrations per hour (8 beats per second) | 35 jewels | -Date display |
| Automatic 3-Day Power Reserve GMT Caliber 9S66 (Automatic with manual winding mechanism) |
+5 to -3 seconds per day | +10 to -1 seconds per day | Approximately 72 hours | 28,800 vibrations per hour (8 beats per second) | 35 jewels | -Dual time function with 24-hour hand
-Quick correction function of time difference adjusting to a calendar |
| Automatic 3-Day Power Reserve Caliber 9S65 (Automatic with manual winding mechanism) |
+5 to -3 seconds per day | +10 to -1 seconds per day | Approximately 72 hours | 28,800 vibrations per hour (8 beats per second) | 35 jewels | -Date display |
| Manual-winding Caliber 9S64 (Manual winding mechanical ) |
+5 to -3 seconds per day | +10 to -1 seconds per day | Approximately 72 hours | 28,800 vibrations per hour (8 beats per second) | 24 jewels | - |
| Manual-winding with a Small Seconds Hand Caliber 9S63 (Manual winding mechanical ) |
+5 to -3 seconds per day | +10 to -1 seconds per day | Approximately 72 hours | 28,800 vibrations per hour (8 beats per second) | 33 jewels | -Power reserve indicator
-Small seconds hand |
| Small Size Automatic Caliber 9S27 (Automatic with manual winding mechanism) |
+8 to -3 seconds per day | +10 to -5 seconds per day | Approximately 50 hours | 28,800 vibrations per hour (8 beats per second) | 35 jewels | -Date display |
- Mean daily rate is a mean value of daily rates in a condition where the movement before assembly in a case is measured in six positions in a fixed manner under artificially controlled environment for 12 days.
