Reference Number
SLGH031G
With its intricate pattern and silvery white hue, the watch’s dial dynamically expresses the white birch forests that grow in profusion near the Grand Seiko Studio Shizukuishi, the manufacturing base for Grand Seiko’s mechanical watches. Inside is the mechanical high-beat Caliber 9SA5, a Grand Seiko-exclusive automatic movement. Thanks to its innovative Dual Impulse Escapement and twin barrels, it delivers a high frequency of 36,000 vibrations per hour and an impressive power reserve of approximately 80 hours when fully wound. Both the case and bracelet are made of Ever-Brilliant Steel, which shines brighter than conventional stainless steel while offering exceptional corrosion resistance.
TECHNICAL SPECIFICATIONS
Exterior
Exterior: Ever brilliant steel
Case back: See-through & Screw case back
Glass Material: Box shaped sapphire crystal
Glass Coating: Anti-reflective coating on inner surface
Case size: Diameter 40.0mm Lug-to-lug 47.0mm Thickness 11.7mm
Band width: 22mm
Clasp type: Micro-adjustment clasp
The perimeter of Band: 197mm
Movement
Caliber no.: 9SA5
Movement Type: Self-winding with manual-winding
Power reserve: Approx. 80 hours
Normal usage accuracy: +8 to -1 seconds per day
Mean daily rate: +5 to -3 seconds per day
Mean daily rate is a mean value of daily rates in a condition where the movement before assembly in a case is measured in six positions in a fixed manner under artificially controlled environment for 12 days.
Functions
– Water resistance: 10 bar
– Magnetic resistance: 4,800 A/m
– Weight:165 g
– Other details: Screw-down crown
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