Grand Seiko “Moonlit Birch” SLGW007

This 10-beat, manual-winding mechanical timepiece is built upon the Evolution 9 Style—a distinctive design language that elevates Grand Seiko’s philosophy through the lens of Japanese aesthetics. Its richly textured navy dial draws inspiration from the bark of a white birch tree bathed in moonlight, offering depth and quiet sophistication.

Housed in a slender stainless steel case measuring just 9.95mm thick, the watch embodies the elegance expected of a Grand Seiko dress piece. A finely proportioned bezel with a narrow profile flows seamlessly into sharply defined lugs, while the clean geometry of the indexes mirrors these lines across the dial.

At its core is the manual-winding Caliber 9SA4, a high-frequency movement beating at 10 vibrations per second to ensure exceptional accuracy, alongside an impressive power reserve of up to 80 hours. Enhanced winding efficiency is achieved through a reengineered gear train and redesigned components, allowing the movement to reach full power with 15 percent fewer crown rotations than its counterpart, the Caliber 9SA5.

Thanks to this refined movement architecture, the watch maintains a balanced and elegant profile, measuring 38.6mm in diameter while preserving its remarkably slim 9.95mm case thickness.

Exterior: Stainless steel

Caseback: Stainless steel and sapphire crystal

Case back: See-through case back: Case back with 4 screws

Glass Material: Box shaped sapphire crystal

Glass Coating: Anti-reflective coating on inner surface

Case Diameter: 38.6mm

Lug-to-lug: 45.0mm

Case Thickness 9.95mm

Band width: 20mm

Band Material: Cow leather

Clasp type: Three-fold clasp with push button release

The perimeter of Band: 195mm

Movement: Caliber no.: 9SA4

Movement Type: Manual winding

Power reserve: Approx. 80 hours

Mean daily rate:+5 to -3 seconds per day

Normal usage accuracy: +8 to -1 seconds per day

Water resistance: Splash Resistant

Magnetic resistance:4,800 A/m

Weight:74 g

Other details / Features:

• Power reserve indicator