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All Grand Seiko Spring Drive timepieces are designed, made, assembled and adjusted by the skilled craftsmen and women of the Shinshu Watch Studio, which is located in central Japan and surrounded by the Hotaka mountain range whose tallest summit is 3,190 metres high. As the Hotaka mountain range was created by volcanic activity, its peaks and slopes have sharp ridges and sheer cliffs which, even when carved by the wind and snow over the millennia, reveal nature at its most dramatic. This watch’s dial has the color and texture that typify the geology of the Hotaka range.
Thanks to Grand Seiko’s unique Spring Drive caliber, the seconds hand glides silently and smoothly, with no ‘tick’, across the dial, perfectly reflecting the natural and continuous flow of time. The power reserve is 72 hours when fully wound and is shown on the discreet indicator next to the eight o’clock marker. The GMT hand allows a second time zone to be shown and the hour can be adjusted without compromising the one-second-a-day precision of Spring Drive.
Exterior
Exterior: Stainless steel
Caseback: Stainless steel and sapphire crystal
Case back: Screw case back
Glass Material: Dual-curved sapphire crystal
Glass Coating: Anti-reflective coating on inner surface
LumiBrite: LumiBrite on hands, index(es) and bezel
Case size: Diameter 44.0mm
Lug-to-lug 50.8mm
Thickness 14.7mm
Band width: 21mm
Clasp type: Three-fold clasp with push button release
The perimeter of Band: 194mm
Movement
Caliber no.: 9R66 Instructions
Movement Type: Spring Drive
Power reserve: Approx. 72 hours (3 days)
Accuracy: ±15 seconds per month (±1 second per day)
Functions
Water resistance: 20 bar
Magnetic resistance: 4,800 A/m
Other details / Features: