9R SPRING DRIVE MOVEMENT

MANUAL-WINDING SPRING DRIVE

Calibre 9R31

MANUAL-WINDING SPRING DRIVE

Calibre 9R31

A manual-winding Spring Drive from Shinshu Watch Studio with the same concept as Calibre 9R02.

Created at the same time as Calibre 9R02 from Micro Artist Studio, Calibre 9R31 has Dual-Spring Barrel with two mainsprings set in parallel within a single barrel, to deliver a power reserve of 72 hours.

SPECIFICATIONS

Winding mechanism

Manual winding

Accuracy

±15 seconds per month(±1 second per day)

Power reserve

Approximately 72 hours

Number of jewels

30 jewels

Features

-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.

CALIBRE 9R31 MODELS

9R SPRING DRIVE MOVEMENT

Calibre 9R31 | SPRING DRIVE | MOVEMENT | ABOUT | Grand Seiko