Grand Seiko Heritage Watch with Tree-Rings Dial Reference SLGA008, Seiko 140th Anniversary Limited Edition

As part of the 140th anniversary celebration of Seiko Watch Company, Grand Seiko has recently released a high-beat watch boasting a tree-rings inspired dial. Now a new rose gold model with the same design theme joins the exclusive 140th Anniversary collections. The new Grand Seiko Heritage Watch (reference SLGA008) houses a new Spring Drive movement, Caliber 9RA2.

Grand Seiko Heritage Watch with Tree-Rings Dial (reference SLGA008), Seiko 140th Anniversary Limited Edition

The Grand Seiko Spring Drive 5 Days Caliber 9RA2 inherits all the performance characteristics of the Caliber 9RA5 introduced last year in celebration of the 60th anniversary of Grand Seiko.

The new setting of the watch hands and the power reserve indicator moved to the movement’s back gives the watch a slender and elegant feel upon observation of the dial and enhances the dial’s exquisite craftwork signature to Grand Seiko.

Grand Seiko Heritage Watch with Tree-Rings Dial (reference SLGA008), Seiko 140th Anniversary Limited Edition

The beauty of the movement and its spectacular Shinshu Frost Finish are visible through the sapphire crystal case back. The delicate texture of the movement’s finish reflects the frost that winter brings to the forests in Shinshu where all Spring Drive watches are made. The bridge lines and hole edges are diamond-cut to reflect light from all angles.

Grand Seiko Spring Drive Caliber 9RA2

Caliber 9RA2 allows the new timepiece to be slimmer than any other current automatic Spring Drive creation. The movement achieves its slimness thanks to the re-design and re-positioning of the Magic Lever. This Offset Magic Lever is positioned away from the center of the movement to reduce its thickness. The new setting of the hands also contributes to the slender profile of the watch.

The movement may be slim but it has enhanced rigidity and shock resistance thanks to the new layout of the gear train towards the center of the movement and the One-Piece Center Bridge that holds them together.

Caliber 9RA2 incorporates two barrels, one larger and one smaller, that deliver a power reserve of up to 120 hours. The ±10 seconds per month accuracy rate is made possible by a new IC with a built-in temperature sensor, and to the selection of highly stable quartz oscillators that have gone through a three-month aging process.

The quartz oscillator and temperature sensor are vacuum-sealed into a single package to eliminate even the slightest temperature difference between the two to maintain the watch’s accuracy at the highest possible level.

Grand Seiko Spring Drive SLGA008, Heritage Watch Collection

The miniscule but visible variations in the dial’s depth reveal the subtlety of the dark and light tones of the wood grain. The brown tone of the dial perfectly matches the 18k rose gold case to give the watch a gentle and warm feel.

Grand Seiko Heritage Watch with Tree-Rings Dial (reference SLGA008), Seiko 140th Anniversary Limited Edition

The watch’s design is true to the Grand Seiko Style defined back in 1967 with the celebrated 44GS. But its heritage is combined with a contemporary feel that perfectly expresses the quiet but strong character of Grand Seiko. Its powerful hands and grooved, prominent markers ensure perfect legibility. The Zaratsu polished, distortion-free mirror finish and the delicate hairline finish alternate on the case to create a quiet and harmonious glow.

As is Grand Seiko’s tradition, the star mark at six o’clock indicates that the indexes are solid gold, as are the GS letters, the calendar frame and the clasp. The hour hand is large in volume and crafted to align exactly with the grooved and prominent hour markers, enhancing the legibility of the time.

The watch will be available as a limited edition of 140 pieces at the Grand Seiko Boutiques and selected Grand Seiko retailers worldwide in November 2021.

Technical details

Grand Seiko Spring Drive Reference SLGA008
Grand Seiko Heritage Watch Collection, Seiko 140th Anniversary Limited Edition

Spring Drive 5 Days Caliber 9RA2
Driving system: Automatic
Accuracy: ±0.5 seconds per day (±10 seconds per month)
Power reserve: 5 days (120 hours)
Number of jewels: 38
Diameter: 34.0mm, Thickness: 5.0mm

Case and bracelet
18k rose gold case and clasp
Dual-curved sapphire crystal with anti-reflective coating
See-through screw case back
Water resistance: 10 bar. Magnetic resistance: 4,800 A/m
Diameter: 40.0mm, Thickness: 11.8mm
Crocodile strap with three-fold clasp with push button release

Approximate recommended retail price in Europe: €50,000

Limited edition of 140 pieces