A high beat caliber opens a new chapter in the history of Grand Seiko

In 1998, the creation of the 9S mechanical caliber opened a new chapter in the Grand Seiko story. Today, the pages turn again with the launch of a new high beat mechanical caliber, 9SA5, which, in its design and functionality represents an advance just as important as the first 9S.
9SA5 is more than just a new caliber. It is an entirely new movement and the foundation upon which a whole new generation of Grand Seiko mechanical watches will be created. Deploying all the skills and experience we have gained over the past 60 years, 9SA5 is, beyond doubt, the finest mechanical caliber that we have ever created. A watch offered in a limited edition of 100 will be the first to be powered by this new caliber. It will be available at the Grand Seiko Boutiques in August 2020.

Design and function in perfect harmony.
36,000 vph, 80 hours of power reserve and a slim profile.

The challenge for any watchmaker who creates a high beat movement is to strike the perfect balance between precision, power and size without compromising on any of these parameters.
In developing the 9SA5 caliber, the Grand Seiko development team set out to deliver the same level of stable accuracy as that of their existing 36,000 vph movement but to deliver a longer power reserve and so makes the watch even more practical in everyday life. They succeeded in characteristically uncompromising style. Caliber 9SA5 has a precision rate of +5 to -3 seconds a day and a power reserve of 80 hours.

The three technical advances that make the difference

The precision, power and slimness of Caliber 9SA5 are the result of the radical re-design of three key structures and some components within them for which several patents are either already granted or pending.

1. Dual Impulse Escapement

2. Grand Seiko Free-sprung Balance

3. Horizontal Gear Train

In addition to these three new components, Caliber 9SA5 has other features that contribute to its extraordinary performance. Two barrels, arranged in sequence, enhance the power reserve, the date change is virtually instantaneous and the positioning of the winding stem close to the rotor allows the watch to sit closer to the wrist.

The movement is as beautifully finished as it is efficient. The bridge has a gently curving outline that is inspired by the shapes of Mt. Iwate and a bend in the Shizukuishi River that runs near the studio where the watch is made.

A new design for a new era

Just as Caliber 9SA5 makes a significant and defining statement about the next stage of Grand Seiko’s technical development, the design also has a distinctive look that marks a new beginning. The watch is, of course, true to the Grand Seiko Style that was defined back in 1967 with the celebrated 44GS but it is subtly different in ways that are much more than cosmetic.
This new design has all the hallmarks of Grand Seiko but also offers enhanced comfort and legibility.

The slimness of the caliber does much to ensure that the watch can sit easily but it is combined with slightly wider lugs so that the watch also stays more solidly on the wrist. The already legendary legibility of Grand Seiko is further enhanced by the increased volume of the hour hand and by the hour markers that are more prominent, just as they were in the first Grand Seiko of 1960. The Grand Seiko logo, indexes and calendar frame are in 18k yellow gold.