Grand Seiko Evolution 9 ‘Tentagraph’ Hi Beat Automatic Chronograph Watch

This watch marks a new level of innovation for the Grand Seiko brand as it is the timepiece with the longest power reserve for a 10 beat Hi beat automatic chronograph. It’s named for its TEN beats per second, Three days power reserve, Automatic ChronoGRAPH.

Operating on a newly created 9SC5 movement at ten beats per second, this chronograph was designed to pursue stable accuracy in any condition. The movement – with its 72-hour-long power reserve and 10-beat frequency – as well as the chronograph’s modular mechanism, combining a column wheel for operations and a vertical clutch for transmission, makes this possible. As a result of this watch, the Takumi revised the Grand Seiko testing procedure for mechanical chronographs to create a new inspection standard – from 17 days previously, to twenty days so that the accuracy requirements are also applied to the movement while the chronograph is operating in three different positions.

From the Evolution 9 collection, the pattern on its blue dial resembles a starry winter night on Mount Iwate. The day calendar matches the dial colour for the first time in a Grand Seiko and is positioned between the 4 o’clock and 5 o’clock markers. With a smaller case size than Spring Drive chronograph models, the bezel is black ceramic, whilst the case and bracelet are made from light weight and durable high-intensity titanium.

The watchmakers’ pride in their surroundings is represented from engineering watch movements which emulate the smooth motion of time passing, to creating dials reflecting the beauty of Japanese nature – a Japanese spirituality where each moment is a unique expression unveiled through light and shadow.

Every Grand Seiko features signature high standards of precision, durability and legibility, handcrafted in Japan by Takumi artisans. Grand Seiko: beautifully, precise Japanese watchmaking, from the pinnacle of Seiko Watch Corporation’s in-house manufacture.

* The Tentagraph has been nominated for the 2023 GPHG Awards in the Chronograph category.

GPHG, also known as the Grand Prix d’Horlogerie de Genève, recognises worldwide excellence in watchmaking and is essentially the watch world equivalent of the Oscars.

Movement

Accuracy:-3/+5 seconds per day
Calibre:9SC5
Movement Type:Automatic with Manual Winding
Power Reserve:72 Hours

Watch Exterior

Case Diameter:43.2mm
Case Length:51.5mm
Case Thickness:15.27mm
Case Material:High Intensity titanium
Case Back:See-through & screw case back
Strap/Bracelet:Titanium
Lug Width:23.0mm
Clasp:Three-fold clasp with push button release
Dial Colour:Blue

Other Specifications

Crystal Coating:Anti-reflective coating on inner surface
Crystal Type:Box shaped sapphire crystal
Water Resistance:10 bar
Magnetic Resistance:4,800 A/m
Weight:154.0g
LumiBrite:Lumibrite on hands and indexes
Other Specifications:Screw-down crown, Allergy-safe metal, Chronograph with 30 minutes & 12 hours