mechanical chronograph that imparts the spirit of Mt. Iwate, reflecting the morning sunrise.

This mechanical chronograph, which has been created in the Evolution 9 Style, takes the fusion of Grand Seiko’s spirit with the aesthetic sensibilities of Japan to a high level. The dial pattern is reminiscent of Mt. Iwate, the peak visible from Grand Seiko Studio Shizukuishi, where Grand Seiko’s mechanical watches are manufactured. Its copper-pink color exudes a dignified presence as if bathed in morning sunlight.

Powered by the Caliber 9SC5, a chronograph movement vibrating at 10 beats per second, this creation operates continuously for up to about 72 hours (about 3 days) when fully wound.

Mt. Iwate is thought to have been formed around 700,000 years ago and has been one of the most active volcanoes in all of Japan, a country with more than 100 active volcanoes. One can sense the history of this soaring peak from its rough surface, etched by the traces of lava flows that extend along the north side. The striking radial dial pattern is inspired by a bird’s-eye view of Mt. Iwate’s ridge line.

The space between the hands and the dial and indexes has been reduced as much as possible, allowing the wearer to see the time at a glance, even on a chronograph that displays a wealth of information. The date display, placed between the four and five o’clock positions, allows all twelve indexes to be placed in a way that ensures maximum legibility of the sub-dials.

The Tentagraph’s name describes key features of the Caliber 9SC5 movement inside: Ten beats per second, three days of power reserve, automatic winding, and chronograph. Fully wound, the watch runs for 72 hours even with the chronograph in operation.

TECHNICAL SPECIFICATIONS

• Case Material : High-Intensity Titanium, 18k Rose Gold, Ceramic Case Diameter : 43.2mm

• Case Thickness : 15.3mm

• Case Length : 51.5mm

• Lug Width : 23mm

• Dial Color : Copper Pink

• Crown : Screw Down

• Strap/Bracelet : High-Intensity Titanium + 18k Rose Gold w. three-fold clasp

• Crystal : Box-Shape Sapphire

• Caseback : High-Intensity Titanium with Sapphire Crystal Special : Limited Edition 300 pieces

• Caliber : 9SC5

• Type : Hi-Beat 36000 Chronograph

• Power Source : Automatic

• Accuracy : +5 to -3 seconds per day (when static) Duration : 72 Hours

• Features : Time, Date, Chronograph Water Resistance : 100m

• Magnetic Resistance : 4,800 A/m

• Public Disclosure: 09/10/2025 Start Sales: 10/1/2025

• Shop Classification: Salon Price: $22,600

• Limited Edition: 300 pieces