Automatic 3-Day Power Reserve GMT

Caliber 9S66

Caliber 9S66 offers all the performance characteristics of Caliber 9S65 — but comes with the addition of the GMT function.

Pulling the crown out by one notch enables the hour hand to be adjusted without stopping the minutes or seconds hand so that the accuracy is not compromised.

The watch is the embodiment of the Grand Seiko pursuit of high accuracy, maintaining exceptional precision in both the essential time 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 +10 to -1 seconds per day
Reserva de marcha Approximately 72 hours
Vibrações 28,800 vibrations per hour (8 beats per second)
Número de rubis 35 jewels
Características -Dual time function with 24-hour hand
-Quick correction function of time difference adjusting to a calendar

What makes 9S Mechanical special?

The concept of Grand Seiko was born from the desire to build the world's best watch, and the collection continues to push precision in mechanical watches to the limits of timekeeping technology.
As a true manufacture, Grand Seiko combines the latest technology with hand craftsmanship to raise the art of mechanical watchmaking to the highest possible level.