Concluding 60th anniversary celebration of Grand Seiko, the Japanese fine watch brand has released a limited edition watch (reference SLGH003) equipped with the revolutionary automatic caliber 9SA5.
Introduced in March 2020, 9SA5 is an entirely new high beat mechanical movement. Developed from scratch exclusively for Grand Seiko, Caliber 9SA5 will be the foundation upon which a whole new generation of Grand Seiko mechanical watches will be created. Nine years in development and deploying all the skills and experience that Grand Seiko has gained over the past 60 years, 9SA5 is without doubt the finest mechanical caliber Grand Seiko has ever created.
9SA5 has a precision rate of +5 to 3 seconds a day and a power reserve of 80 hours and yet is 15% slimmer than the current Grand Seiko high beat caliber. The precision, power and slimness of Caliber 9SA5 are the result of the radical re-design of three key structures, and components within them, for which several patents are either already granted.
1. The Dual Impulse Escapement
The escapement is entirely new and was developed inhouse. It enables the escapement wheel to transmit power directly to the balance, leading to a significant energy transfer efficiency increase. It is unique in that, in one direction, power is transmitted directly to the balance while, in the other direction, it is via the pallet fork, as in a traditional escapement. Both the pallet fork and the escapement wheel are made using MEMS technology.
2. The Grand Seiko Free-sprung Balance
9SA5 uses a new free-sprung balance, again developed especially for this caliber. It retains its precision for longer and is more resistant to shock and friction. While other 9S calibers uses a flat hairspring, 9SA5 uses an overcoil, whose curved shape was decided after more than 80,000 simulations, with the result that its performance is optimized in every possible position. Its unique design improves the isochronism.
3. The Horizontal Gear Train
The new caliber is 15% slimmer than the current Grand Seiko high beat caliber, thanks to the innovative horizontal layout of the barrel and gear trains. The movement finish is inspired by the rippling waves of the Shizukuishi River near the studio where the watch is made.
The watch shares the same design as the first 9SA5 creation. Its powerful and distinctive look is true to the Grand Seiko Style that was defined back in 1967 with the celebrated 44GS but the hour hand has greater volume and the indexes are more prominent, just as they were, in fact, in the very first Grand Seiko of 1960. The dial is in Grand Seiko blue against which the red second hand provides a vivid accent.
Its stainless steel case measures 40mm diameter. The case has all the design hallmarks of Grand Seiko and is Zaratsu polished to perfection. With its wide lugs and with a generously sized bracelet, the watch offers perfect comfort and fits solidly on the wrist. The clasp carries Grand Seiko initials in 18k gold.
Boasting a dial in a deep, shimmering blue, this new creation will be available in December in a limited edition of 1,000 at Grand Seiko Boutiques and selected retailers worldwide.
Model: Grand Seiko 60th Anniversary Limited Edition, Reference SLGH003
Caliber 9SA5 Hi-Beat 36000 80 Hours
Driving system: Automatic
Vibrations: 36,000 vibrations per hour (10 beats per second)
Accuracy (mean daily rate):+5 to -3 seconds per day
Power reserve: 80 hours
Number of jewels: 47
Magnetic resistance: 4,800 A/m
Stainless steel case
Diameter: 40 mm
Box shaped sapphire crystal with anti-reflective coating
See-through screw case back
Water resistance: 10 bar
Stainless steel bracelet
Three-fold clasp with push button release and Grand Seiko initials in 18k gold
Limited edition of 1,000 pieces
Approximate recommended retail price in Europe: €10,000