Spring Drive 3.5 Days

Caliber 9R02

"A new Spring Drive masterpiece from the Micro Artist Studio.

The Micro Artist Studio made its first contribution to Grand Seiko with the 8-Day Power Reserve Spring Drive watch that was greeted at Baselworld 2016 with great acclaim.

This same elite team of watchmakers now presents Caliber 9R02, a new movement that has two mainsprings set in parallel within a single barrel and uses the unique Torque Return System to deliver a power reserve of 84 hours."

Specifications

Winding mechanism Manual winding
Accuracy ±1 second per day (±15 seconds per month)
Power reserve Approximately 84 hours
Number of jewels 39 jewels
Features -Torque Return System
-Dual-Spring Barrel
-Power reserve indicator

What makes 9R Spring Drive special?

Spring Drive, one of the great innovations in modern watch making history, regulates a spring-driven movement with state-of-the-art electronic technology that functions without batteries or other external power source. Its sole power source is a mainspring, which drives a series of gears. A rotor, connected to the end of these gears, generates a small electrical charge that activates an electronic circuit and quartz oscillator. Its accuracy is unprecedented for a watch wound by a mainspring. The development of the 9R Spring Drive movement was possible only because Grand Seiko is one of the few manufacturers with expertise in both mechanical and electronic watches.

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