Grand Seiko Caliber 9S65

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.

• Read more: Official 9S65 operating instructions from Seiko