Hi-Beat 80 Hours White Birch

Explore the majesty of a white birch forest

With its intricate pattern and silvery white hue, the Grand Seiko Hi-Beat White Birch dial dynamically expresses the white birch forests that grow in profusion near the Grand Seiko Studio Shizukuishi, the manufacturing base for Grand Seiko’s mechanical watches. Inside is the mechanical high-beat Caliber 9SA5, a Grand Seiko-exclusive automatic movement. Thanks to its innovative Dual Impulse Escapement and twin barrels, it delivers a high frequency of 36,000 vibrations per hour and an impressive power reserve of approximately 80 hours when fully wound. Both the case and bracelet are made of Ever-Brilliant Steel, which shines brighter than conventional stainless steel while offering exceptional corrosion resistance.

Born in the pursuit of the ideal wristwatch, the Evolution 9 Style evinces a new design grammar that evolved from the Grand Seiko Style of 1967. Through the Evolution 9 Style, Grand Seiko forges a new path while honoring its origins.

The dial captures the essence of magnificent white birch forests, wrapped in the crisp air of the highlands. Iwate Prefecture, home to the Grand Seiko Studio Shizukuishi, boasts Japan’s largest white birch forest. White birch is a fast-growing, sun-loving species with remarkable vitality. Their straight, white trunks reaching toward the sun evoke both beauty and strength. Inspired by the vast expanse of these trees stretching endlessly across the landscape, Grand Seiko developed the “White Birch Pattern,” a design that conveys the depth and richness of the forest. The silvery-white dial resonates with the vibrant rhythm of the tempered blue seconds hand powered by the high-beat movement.

Thanks to the highly efficient Dual Impulse Escapement and twin barrels, Caliber 9SA5 achieves approximately 80 hours of operation when the watch is fully wound, even with its high-beat rate of 36,000 vibrations per hour. The movement also allows the watches it powers to be more lightweight through a unique horizontal ring construction.

Known as Ever-Brilliant Steel due to its brilliant white hue, this special alloy is more resistant to corrosion than the stainless steels used in even the most prestigious watches today. It has a PREN (Pitting Resistance Equivalent Number) value 1.7 times higher than the grade of steel used in most high-end timepieces . PREN is a widely accepted standard used to measure corrosion resistance.

The tapered bracelet features a three-step micro-adjustment clasp that operates without a tool, allowing a total of 6mm of fine adjustment in precise 2mm increments.