Grand Seiko caliber 9R84
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| Brand: | Grand Seiko |
|---|---|
| Reference: | 9R84 |
| Base: | Grand Seiko 9R01 |
| Movement: | Quartz |
| Display: | Analog |
| Jewels: | 41 |
| Reserve: | 192 |
| Date: | Date |
| Chronograph: | Chronograph, Column wheel |
| Hands: | Hours, Minutes, Seconds, Additional 24 Hour Hand (adjustable) |
| Additionals: | Power Reserve Indicator |
9R84 description
Caliber 9R84 is a self-winding movement with column-wheel chronograph based on Seiko's Spring Drive technology.
As in conventional mechanical watches, the sole power source of Spring Drive is a mainspring that can be wound by the motion of an oscillating weight or by winding the crown. And just as in mechanical watches, the mainspring drives a series of gears that rotate the hour, minute and second hands. A rotor, connected to the end of these gears, generate a small electrical charge that activates an electronic circuit and quartz oscillator.