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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.

Grand Seiko Caliber 9S65

Is the Grand Seiko Caliber 9S65 any good? Share your opinions, experiences and watches below... Keep comments respectful and follow our community guidelines.

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Jorge Robles
Jorge Robles

This Seiko caliber abandons the use of the “Magic Lever” as its automatic winding mechanism, using the more industry-standard of the reversing wheels. Here is a copy of the general description of this movement obtained from the official Seiko web site and quote: “Caliber 9S65 is the most standard automatic movement that typifies the 9S mechanical series. The old and new movements may appear to have a similar design, but they are utterly different in terms of performance. Grand Seiko has not only revised the materials used to make this movement, but also applied MEMS (Micro Electro Mechanical System) technology,… Read more »


Can you help, what is the measurement for the second hand so i cam get the right size


Dude this isn’t a cheap Seiko diver. You’d better sent it back to Grand Seiko for that!