Case Material : Stainless steel Glass Material : Dual-curved sapphire crystal Glass Coating : Anti-reflective coating on inner surface Case size : Diameter 40mm Lug-to-lug 46.2mm Thickness 14mm The perimeter of Band : 195mm Clasp type : Three-fold clasp with push button release
Caliber no. : 9S86 Movement Type : Automatic with manual winding Power reserve : Approx. 55 hours Mean daily rate : +5 to -3 seconds per day Normal usage accuracy : +8 to -1 seconds per day
Water resistance : 10 bar Magnetic resistance : 4,800 A/m Weight : 159.0 g Other details / Features :
- ・24-hour hand (dual time display function)
- ・37 jewels
- ・Calendar-linked time difference adjustment function
- ・Case back with lion emblem
- ・Date display
- ・Screw case back
- ・Screw-down crown
- ・See-through case back
- ・Stop seconds hand function
This model incorporates Caliber 9S86, the high-specification movement that delivers the same accuracy (-5 to +3 seconds a day) and the same power reserve (55 hours) as the core Caliber 9S85, while also offering the GMT function that the international traveler needs to ensure that the accuracy of the time shown is not compromised when the time zone is changed. The GMT hand shows the time in the home time zone.
The exterior design is a modern take on the stunning 'Grand Seiko Style'—the embodiment of the Grand Seiko design philosophy which was first established for the 44GS in 1967—and features a distortion-free, wide mirror surface throughout.
A beautifully delicate and polished finish has been created on the dial, with a 'Mount Iwate pattern', inspired by the many-ridged contours of the Mt. Iwate, the mountain that is visible through the windows of the Shizuku-Ishi Watch Studio where Grand Seiko mechanical watches are made.
The pursuit of precision
Precision. It's the pursuit of every watchmaker. When Grand Seiko was born in 1960, it was ready to break tradition. After meeting the chronometer standards of the time, Grand Seiko set its own accuracy standards in 1966. By 1998, advancements in materials and craft gave rise to the New Grand Seiko Standard. Every movement undergoes rigorous testing in six positions and three temperatures over seventeen days. The craftsmen and women uphold their commitment to quality while consistently exploring the limits of possibility.