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9R SPRING DRIVE MOVEMENT

AUTOMATIC SPRING DRIVE 3-DAY GMT

Caliber 9R66

AUTOMATIC SPRING DRIVE 3-DAY GMT

Caliber 9R66

In 2006, just two years after the completion of Caliber 9R65, Grand Seiko's first 9R Spring Drive movement with GMT function, the Caliber 9R66, was unveiled.

"GMT" stands for Greenwich Mean Time, and uses a 24-hour hand (GMT hand) as the fourth hand on the watch dial in addition to the hour, minute and second hands.

SPECIFICATIONS
Driving system Automatic with manual winding mechanism
Accuracy ±1 per day (±15 seconds per month)
Power reserve Approximately 72 hours
Jewels 30 jewels
Remarks Power reserve display function, Dual time function with 24-hour display

What is the Spring Drive?

Spring Drive is a unique watch technology that combines the power derived from a mainspring with the high accuracy of an electronic watch. Like all other mechanical watches, Spring Drive uses the energy generated by the movement of the wearer’s wrist to move the hands, but it also uses this to create electrical energy that powers a unique regulator that is up to ten times more accurate than any traditional escapement.

The Tri-synchro regulator combines three types of power:

1. Mechanical power (to generate and store energy in a mainspring)
2. Electrical power (to activate an IC and quartz oscillator)
3. Magnetism (to apply a brake to the hands via a rotor/stator)

The combined operation of these three functions delivers one second a day precision and gives Spring Drive its unique signature, the elegant glide motion of the second hand as it moves around the dial, accurately, smoothly and silently.

Spring Drive combines the best elements of both mechanical and electronic watches. While three-hand versions have over 200 components, versions with more functions, such as the Spring Drive chronograph have well over 300, all of which are assembled by hand.

LEARN MORE ABOUT SPRING DRIVE