About Grand Seiko SLGH003
Grand Seiko Heritage Collection
60th Anniversary Limited Edition Mechanical Hi-beat 36000 80 Hours
First revealed 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. A new addition to the 60th anniversary collection provides a perfect showcase for this revolutionary caliber. With a stainless steel case and 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.
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. The case has all the design hallmarks of Grand Seiko and is Zaratsu polished to perfection. With its wide lugs and with a bracelet that is satisfyingly substantial, the watch offers perfect comfort and fits solidly on the wrist.
Limited Edition of 1,000 pieces.
About 9S Mechanical
In 1968, Grand Seiko introduced Japan’s first automatic 10-beat watch (61GS) to the world.
In 2009, 10-beat Caliber 9S85 surpassed the original, with high precision parts created using sophisticated modern technology assembled with skills honed over the many decades of Grand Seiko’s watchmaking.
Innovations to the precision controlling mainspring, the hairspring, and the escapement mean that the 9S Mechanical is not simply a revival of the 10-beat movement of the past, but an entirely new incarnation of this high-precision movement.
Grand Seiko SLGH003 Concept :
Revolutionary Automatic Caliber 9SA5
The three innovations that set Caliber 9SA5 apart
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 in-house. 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.
Grand Seiko SLGH003 Features :
- 47 jewels
- Case back with lion emblem
- Date display
- LIMITED EDITION on the case back
- Screw case back
- Screw-down crown
- See-through case back
- Serial number engraved on the case back
- Stop seconds hand function
Grand Seiko SLGH003 History :
Prior to 1960, to challenge the status of Swiss watches and change the perception of Japanese watches, Daini Seikosha and Suwa began the discussion of a product line that can match the quality of Swiss watches under the suggestion of the parent company. At the time, Suwa Seikosha Co. was in charge of manufacturing men’s watches, so it was decided that Suwa would be producing the first Grand Seiko (GS).
The first Grand Seiko was released in 1960, it was based on Seiko’s previous high-end watch, CROWN. This Grand Seiko has a 25-jewel, manual-winding, 3180 caliber, and only 36,000 units were produced. This was also the first chronometer-grade watch manufactured in Japan, and it was based on Seiko’s own chronometer standard.
The design language of the Grand Seiko was set in 1967, with the creation of Grand Seiko 44GS. The 44GS set the ground for all future Grand Seiko with nine elements. These elements help improve the legibility of the watch under different situations, and create a sharp, crisp visual impression:
- Double width index at 12 o’clock
- Multi-faceted rectangular markers
- Highly polished bezel
- Highly polished planes and two-dimensional surface
- Half recessed crown
- Flat dial
- Multi-faceted hour and minute hands
- Curved side line
- Reverse slanted bezel wall and case side
- Dress style with simple but beautiful design
- Zaratsu polishing
source : wikipedia