| Brand | Seiko |
| Caliber Number | 9S65 / 9S65A |
| Movement Type | Automatic |
| Jewels | 35 |
| Power Reserve | 72 hours |
| Vibrations Per Hour | 28,800 |
| Hairspring | Spron 610 |
| Shock System | Diashock |
| Features | Hours, minutes, central seconds, date |
| Country of Manufacture | Japan |
| Known Models | SBGR051 |
Seiko in-house caliber 9S65A found in a Grand Seiko automatic watch. This caliber was released in 2010 and is essentially an upgrade from GS cal. 9S55 which offered a lower 48 hr power reserve. The 9S66 found in the limited edition GMT has a blue titanium/tungsten rotor featuring a Grand Seiko lion crest. The Spron 610 hairspring is anti-magnetic. This Grand Seiko movement is rated to be accurate within -3/+5 seconds/day.
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