Automatic Spring Drive 3-Day
Caliber 9R65
While the first Spring Drive watch was presented in 1999, it was not until after a further four years of intensive development that the first Grand Seiko 9R Spring Drive was created. To meet the high standards of Grand Seiko, the winding system and drive time were upgraded from a manual winding system with 48 hours of power reserve to automatic with a 72-hour power reserve. The automatic winding mechanism uses the Magic Lever mechanism developed in 1959, but with improved productivity, maintainability, and durability to enhance its winding efficiency.
Caliber 9R65 is currently the most standard of the 9R Spring Drive movements, and is used in many Grand Seiko models.
Specifications
| Winding mechanism | Automatic with manual winding |
|---|---|
| Accuracy | ±1 second per day (±15 seconds per month) |
| Power reserve | Approximately 72 hours |
| Number of jewels | 30 jewels |
| Features | -Power reserve indicator
-Date display |
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.
