Evo 9 'Moonlit Birch Bark' SLGW007

This timepiece embodies technical watchmaking precision with Japanese beauty – powered by the first 10 beat manual-winding movement created by the brand in fifty years. Its dial features the ‘birch bark’ dial pattern inspired by the white birch forests illuminated in moonlight, near Shizukuishi studio where all Grand Seiko mechanical watches are crafted.

The Moonlit Birch Bark, in the Evolution 9 style, features box sapphire crystal glass with an anti-reflective coating; its case, crown and clasp made from stainless steel. Evolution 9 is the latest 2020s stage in Grand Seiko’s “Grammar of Design” framework, first established with the 44GS – a blueprint to maximise sparkle, legibility and wearability for Grand Seiko watches since 1967.

The exhibition case back showcases the in-house 9SA4 10 beat manual-winding calibre, accurate to +5/-3 seconds per day, with a power reserve of approximately 80 hours, due to its twin barrels and the efficient dual impulse escapement. The mechanism is based on the 9SA5 movement, with a re-designed manual-winding mechanism, revised bridge shape, and an elevated wheel finish. The power reserve is now located on the bridge for convenience. Designed to be slim at less than 10mm in depth it is accompanied by a hand stitched calf leather textured strap.

Upon the Hiraniwa Plateau in Iwate Prefecture, where Grand Seiko’s mechanical watches are manufactured, an impressive forest of white birch trees extends across a large area of roughly 1,000 acres. The dial of the SLGW007 is fashioned in a finely detailed design that expresses the beauty of the irregular patterns of tree bark. The colour of the dial is navy, with a slight hint of fading, evoking the bark of a white birch bathed in moonlight.

Every Grand Seiko features signature high standards of precision, durability and legibility, handcrafted in Japan by Takumi artisans.

Movement

Calibre: 9SA4
Power Reserve: 80 Hours
Movement Type: Manual Winding
Mean Daily Rate: +5 to -3 seconds per day

Prior to the assembly of the movement in a case, it undergoes testing in six different positions for 12 days in a controlled environment. The ‘mean daily rate’ is the average value of daily results from these tests.

Watch Exterior

Strap: Leather
Case Diameter: 38.6mm
Case Length: 45mm
Case Thickness: 9.95mm
Lug Width: 20mm
Case Material: Stainless Steel
Clasp: Three-fold clasp with push button release
Dial Colour: Blue

Other Specifications

Weight: 74 Grams
Magnetic Resistance: 4,800 A/m
Water Resistance: Splash Resistant
Crystal Type: Box shaped sapphire crystal
Crystal Coating: Anti-reflective coating on inner surface
Case Back: Display Case back, Power reserve indicator