Grand Seiko
GS 9R65
Spring Drive (Seiko) · introduced 2004
Beat rate
19,800 vph
Power reserve
72h
Jewels
37
Introduced
2004
Escapement
Spring Drive (Seiko)
The 9R65 is Grand Seiko's automatic Spring Drive caliber, combining a mechanical mainspring with a tri-synchro regulator that uses electromagnetic braking to achieve glide-second accuracy of plus or minus one second per day. The Spring Drive mechanism is unique to Seiko Group and cannot be serviced by any independent watchmaker. Collectors prize the smooth glide hand as the defining sensory experience of the caliber.
Specifications
Beats per hour
19,800
Jewels
37
Power reserve
72h
Diameter
30.4mm
Height
6.0mm
Escapement
Spring Drive (Seiko)
Introduced
2004
Finishing
Haute horlogerie
Service interval
3 years
Service cost tier
Luxury
Complications
datequickset
Known service issues
- Glide spring regulator calibration is factory-only and cannot be adjusted in the field
- The intermediate wheel can develop wear noise if the movement runs dry; authorized service required
- Service requires a Grand Seiko authorized specialist; the tri-synchro regulator uses specific tooling unavailable at independent watchmakers
- Budget for manufacturer service pricing; attempting third-party service risks damaging the glide spring, which is the most expensive component to replace
Notable in
- Grand Seiko Spring Drive SBGA011 (Snowflake)
- Grand Seiko Spring Drive SBGA259 (Mt. Iwate)
- Grand Seiko Elegance SBGR305
- Grand Seiko Spring Drive SBGA413 (Birch Forest)
Buying advice
Practical guides for buying a watch with this caliber on the pre-owned market: