Grand Seiko caliber 9R86 in Spring Drive model SBGC005

Seiko Caliber 9R86

Grand Seiko caliber 9R86 in Spring Drive model SBGC005

Brand Grand Seiko
Caliber Number 9R86
Movement Type Spring Drive
Jewels 50
Power Reserve 72 hours
Vibrations Per Hour 36,000
Features Date, power reserve indicator, small seconds, chronograph, 30 minute counter, 12 hour counter, GMT
Country of Manufacture Japan
Known Models SBGC005

Seiko caliber 9R86 found in the Grand Seiko Spring Drive model SBGC005. 50 jewels and consisting of 416 parts. Made in Japan.

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The spring-drive has no escapement like a traditional mechanical movement, it has a small flywheel that smoothly rotates at 6 rpm and is regulated by an electromagnetic field break. The only thing in the watch that actually vibrates is a quartz crystal, the quartz oscillator vibrates at exactly 32,786 Hz which in terms of VBH would be (118,029,600) VBH


Meant the flywheel spins and its speed is sampled 8 times a second, this is counted by a microchip and compared with the quartz, which then regulates an electromechanical field to allow the wheel to spin faster or slower.