caliber9S66

9S MECHANICAL MOVEMENT

AUTOMATIC 3-DAY POWER RESERVE GMT

Caliber 9S66

Caliber 9S66 has all the performance of the most standard automatic movement of the 9S mechanical models — 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 second 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.

SPECIFICATIONS

Driving system

Automatic with manual winding mechanism

Accuracy
(when static)

+5 to -3 seconds per day

Note: Mean daily rate is a mean value of daily rates in a condition where the movement before assembly in a case is measured in six positions in a fixed manner under artificially controlled environment for 12 days.

Normal usage accuracy

+10 to -1 seconds per day

Power reserve

Approximately 72 hours

Vibrations

28,800 vibrations per hour (8 beats per second)

Jewels

35 jewels

Features

- 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.