Manual-winding Mechanical Hi-Beat 36000 80 Hours

Caliber 9SA4

Today, the ritual of winding a watch is one of life’s pleasures.
The simple act of turning the crown taps into the senses to forge a deeper connection with time’s natural flow. In the 1960s and ’70s, manually wound 10-beat Grand Seiko creations were manufactured in the pursuit of better rate stability and higher precision. This year, for the first time in more than 50 years, Grand Seiko announces a new hand-wound high-beat movement, Caliber 9SA4.

规格

上链方式	Manual winding mechanical
精准度(静态条件)*1	+5 to -3 seconds per day
配戴精准度	+8 to -1 seconds per day
动力储存	Approximately 80 hours
振频	36,000 vibrations per hour (10 beats per second)
宝石数	47 jewels
特色	· Dual Impulse Escapement · Twin barrels · Power reserve indicator

此精准度数值是在机芯安装到表壳里以前，测量机芯在12天期间之中的秒数增加/减少数值所求得。此测量作业在人工控制的环境中进行，测量时机芯均有受到6方位的精准度检测控制。

Striving to create the ultimate hand-winding experience

Though the new Caliber 9SA4 has many of the same characteristics as 9SA5 which was released in 2020, nearly 40 percent of the base movement has been redesigned and reconstructed with careful consideration given to the tactile, aural, and visual sensations experienced during winding. The movement’s click, the part that holds the ratchet wheel to prevent the unwinding of the mainsprings, and the click spring, have been tailored to perfect their feel and sound, and the crown stops when the movement is fully powered. Also, a power-reserve indicator on one of the movement bridges tells the watch’s state of wind.

A beautiful movement inspired by the nature of Shizukuishi

The Grand Seiko Studio Shizukuishi, where Grand Seiko mechanical watches are made, is surrounded by rich nature, an ever-present source of inspiration. The click in Caliber 9SA4 is in the shape of a wagtail, a bird recognized as special to Morioka, a city close to the studio. Thanks to the redesign of the movement, the bird-like pecking motion of the click is visible to enjoy during the hand-winding process. Together with delicate finishing inspired by the Shizukuishi River, Caliber 9SA4 not only showcases the very best of Grand Seiko’s mechanical watchmaking capabilities but also captures the beauty of the studio’s natural surroundings.

A thoroughly redesigned and reconstructed movement based on Caliber 9SA5

As with Caliber 9SA5, the new 9SA4 beats 10 times per second while achieving a power reserve of 80 hours when fully wound thanks to its highly efficient Dual Impulse Escapement and two barrels. Both movements use the Grand Seiko Free-sprung Balance and a hairspring with overcoil. As a result, Caliber 9SA4 benefits from the rate stability, resistance to outside interference, and high performance that have long characterized Grand Seiko’s high-beat movements. And, as with other Grand Seiko mechanical movements, 9SA4 is tested in six positions at three different temperatures over 17 days to ensure it meets the Grand Seiko Standard.