Seiko caliber 9R84

Brand: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

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.