Mechanical Hi-Beat 36000 GMT

Caliber 9S86

This high-specification movement delivers the same accuracy (+5 to -3 seconds a day) and the same power reserve (55 hours) as the core Caliber 9S85, while also offering the GMT function that the international traveler needs to ensure that the accuracy of the time shown is not compromised when the time zone is changed. The GMT hand shows the time in the home time zone.

Pulling the crown out by one notch enables the hour hand to be adjusted without stopping the seconds hand so that the highly accurate timekeeping delivered by the Hi-Beat 36000 is not lost. Caliber 9S86 is the embodiment of the Grand Seiko ideal of high accuracy, maintaining exceptional precision in both the essential time of day display and the GMT function.


Mecanismo de corda Automatic with manual winding mechanism
Índice médio diário +5 to -3 seconds per day
Precisão com o uso normal +8 to -1 seconds per day
Reserva de marcha Approximately 55 hours
Vibrações 36,000 vibrations per hour (10 beats per second)
Número de rubis 37 jewels
Características -Dual time function with 24-hour hand
-Quick correction function of time difference adjusting to a calendar

About the Base Caliber 9S85

In Grand Seiko's 10-beat movement, the balance wheel that controls the accuracy of the mechanical watch oscillates at 10 beats per second. This is equivalent to 36,000 oscillations per hour, which earns it the name "Hi-Beat 36000". Ordinary movements beat at a rate of 21,600 vibrations per hour (6 beats per second) or at 28,800 vibrations per hour (8 beats per second).

Grand Seiko's challenge to re-introduce the legacy of the 10-beat movement gave rise to Caliber 9S85, the first movement of its kind in 41 years. The redesigned hairspring and mainspring complement cutting-edge MEMS technology to raise precision and reduce component weight, simultaneously improving durability and securing the torque necessary to maintain a rate of 36,000 vibrations per hour. The movement is practical and reliable, with a maximum power reserve of about 55 hours.