Grand Seiko caliber 9R86 in Spring Drive model SBGC005

Seiko Caliber 9R86

Seiko Caliber 9r86

BrandGrand Seiko
Caliber Number9R86
Movement TypeSpring Drive, Automatic
Power Reserve72 hours
Vibrations Per Hour36,000 bph
FeaturesDate, power reserve indicator, small seconds, chronograph, 30 minute counter, 12 hour counter, GMT
Country of ManufactureJapan
Known ModelsSBGC005

The Seiko caliber 9R86 is a hi-beat automatic spring drive movement. It has 50 jewels and consists of 416 parts. This caliber is entirely made in Japan.

The movement pictured was found in the Grand Seiko Spring Drive model SBGC005.

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6 years ago

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

Kevin Ressler
Kevin Ressler
5 years ago
Reply to  calibercorner

I think what Dan is trying to say is (VPH = none) : Unlike any “hi-beat” or 36,000 VPH watch, the Seiko Spring Drive duplicates the natural constant passage of time. Forward. Any watch that hammers the second hand forward at any number of times per second is a poor imitation of time. 18,000 = five hammerings of the second hand per second. 19,800 = 5.5 . 21600 = 6 . 28,800 = 8 second… Read more »

6 years ago
Reply to  Dan

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.

Venus Caliber 178
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