Grand Seiko's new Wako-exclusive Spring Drive watch features a striking textured dial

Grand Seiko is adding another Japan-exclusive release to its lineup with the SBGA531, a limited-edition watch made exclusively for Wako, the iconic department store in Tokyo’s Ginza district and home to the Grand Seiko Flagship Boutique. This is the second Wako-exclusive release of the year, and it joins the 100-piece ivory-dialled SBGA519 that arrived back in May.

Quite interestingly, the creative inspiration for the latest model came from within Wako’s own walls. The dial’s heavily textured charcoal-gray finish is actually inspired by the custom Mino ware tiled pillars found in the cozy lounge of Grand Seiko’s flagship boutique on the second floor.

The gray dial is accented by a navy blue vapor deposition ring surrounding the inner edge of the crystal and features a blue power reserve indicator near eight o’clock, and a gold-toned applied GS logo beneath the twelve o'clock marker. The sapphire case back features a see-through design printed with a gold lion emblem, a "WAKO LIMITED COLLECTION" inscription, and an engraved serial number.

Like the landmark 40th Wako exclusive model released in May (SBGA519), the watch’s 40mm stainless steel case is a modern interpretation of the 44GS case, a design that helped establish the brand’s “Grand Seiko Style,” and is meticulously finished with the signature Zaratsu polishing, creating flawlessly smooth, distortion-free mirror surfaces that sharply contrast with delicate brushed hairlines. The watch is supplied with a stainless steel bracelet and brown crocodile leather strap featuring a navy cowhide lining.

The SBGA531 is powered by Seiko’s 9R65 Spring Drive caliber, offering a 72-hour power reserve and an average accuracy of ±15 seconds per month. For starters, the proprietary Spring Drive, introduced in 2004 for Grand Seiko, operates as a mechanical-quartz hybrid. It uses a traditional mainspring as its sole power source, but smartly replaces the standard mechanical escapement with an advanced quartz oscillator. This hybrid approach provides the autonomy of a mechanical watch with quartz-like accuracy. Most notably, it gives the seconds hand its signature, exceptionally smooth sweep across the dial.

Pricing & Availability

You’ll have to fly to Japan to get your hands on the new Grand Seiko Heritage Wako Limited Edition, though. Priced at ¥869,000 (~$5,655) and limited to just 150 individually numbered pieces, it’s set to go on sale exclusively at the Grand Seiko Flagship Boutique in Ginza on October 8. Reservations began September 10 and are available in person only.

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Specifications

• Case: Stainless steel
• Dimensions: 40mm diameter × 12.5mm thick × 46.2mm lug-to-lug
• Dial: Textured gray with navy-blue accents
• Crystal: Sapphire crystal with blue vapor deposition around the edge
• Hands: Faceted hour and minute hands; blue steel power reserve hand
• Functions: Hours, minutes, seconds, date, power reserve indicator
• Movement: Grand Seiko Caliber 9R65 Spring Drive
• Winding: Automatic with manual winding
• Accuracy: ±15 seconds per month (±1 second per day)
• Power reserve: 72 hours
• Water resistance: 10 ATM (100 meters)
• Caseback: Sapphire crystal with Grand Seiko lion emblem, “WAKO LIMITED COLLECTION” inscription, and individual serial number
• Bracelet: Stainless steel
• Additional strap: Champagne-brown crocodile leather with navy cowhide underside
• Limited edition: 150 individually numbered pieces