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

Its stainless steel case is 40 millimeters in diameter

The clean ice-white dial features a date calendar and LumiBrite hands and markers

5 mm model in sand-blasted Grade 5 Titanium features a brushed black ceramic bezel ring with its diving scale in Liquidmetal™

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.