Grand Seiko Debuts Their Thinnest Automatic Spring Drive Watches Ever

While Grand Seiko’s Spring Drive watches have always been beautiful, accurate, and fascinating, their main drawback has been that they’re a little on the chunky side. But in their never-ending quest for perfection, the Japanese luxury brand has solved this issue thanks to the new automatic Spring Drive Caliber 9RA2.

Caliber 9RA2 is 0.8mm slimmer than its predecessor, the Caliber 9R6 series. That may not seem like a lot, but in the world of watch movements, it might as well be a mile. The fully-decorated new caliber has a twin-barrel system for a five-day power reserve and is accurate to within ± 10 seconds per month, so there’s certainly no drop in performance with the size reduction. Two watches are set to debut the movement, both of which measure just 11.8mm thick. The stainless steel SLGA007 is limited to 2,021 pieces and has a dial that’s inspired by the blue waters of Lake Suwa. It will go on sale at retailers in December for $8,700. The 18k rose gold SLGA008, with a dial that’s meant to evoke the natural beauty of tree rings, is limited to just 140 pieces and will arrive in November for $49,000.

Purchase: $8,700+

Photo: Grand Seiko