Grand Seiko Evolution 9 Tentagraph SLGC001 sub-collection_constellation Dual curved sapphire crystal with

Dual curved sapphire crystal with anti-reflective coating on the inner surface

A US-exclusive diver inspired by glacial ice formations

blue (+1h in summer) and Sedna™ gold colour (places without daylight savings)

as well as the supple

Its stainless steel case is 40 millimeters in diameter

Grand Seiko Evolution 9 Tentagraph SLGC001 sub-collection_constellation Dual curved sapphire crystal withGrand Seiko's inaugural mechanical chronograph makes its long awaited debut As the Grand Seiko Evolution 9 continues to define the brand's exciting future, the venerable Japanese maker finally introduces its long awaited mechanical chronograph, the Tentagraph. Just like every Grand Seiko creation, the pursuit of precision is at the heart of the new Tenta graph, whose chronograph movement features the revolutionary high beat Caliber 9SA5 as its base.