Grand Seiko caliber 9R84

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Brand:Grand Seiko
Base: Grand Seiko 9R01
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.