Seiko 9S6x Family

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BRANDS: Grand Seiko, Seiko, Shizukuishi Watch Studio

Production: 2006 – Current
1910s	1920s	1930s	1940s	1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s

Seiko 9S6x Family Overview

9S is the family of high-end mechanical watch movements used in the Grand Seiko and Credor watch lines. The current “3 days” 9S6x family debuted in 2006 with Cal. 9S67, and has replaced the Seiko 9S5x series over the following decade. The movement boasts 72 hours of power reserve thanks to a stronger Spron 510 or 610 mainspring and escape wheel and pallet form finished with MEMS technology.

Seiko boasts that these movements can deliver -3/+5 seconds per day accuracy in controlled static tests. On the wrist, the company claims -1/+10 second accuracy per day, and Seiko adjusts them in 6 positions. Adjustment is performed using a screw with index moving a mobile regulator for the flat hairspring.

The 9S family movements are constructed by hand at Seiko’s Shizukuishi Watch Studio in Morioka, Iwate Prefecture, Japan.

All watches in the 9S6x series feature hand winding, hacking seconds, and operation at 28,800 A/h. Most feature automatic winding with a central rotor mounted on five ball bearings. These use a conventional reverser wheel rather than the Seiko Magic Lever system found on the previous Cal. 9S5x series.

Seiko 9S6x Family

	Production	Models	Winding	Jewels	Date	Notes
Cal. 9S61	2015-present	SBGR	Automatic	33	No
Cal. 9S63	2019-present	SBGK	Manual	33	No	Power reserve at 3:00 Small seconds at 9:00
Cal. 9S64	2011-present	SBGW	Manual	24	No
Cal. 9S65	2010-present	SBGR	Automatic	35	Yes
Cal. 9S66	2010-present	SBGM	Automatic	35	Yes	Central GMT hand
Cal. 9S67	2006-2010	SBGL	Automatic	41	Yes	Power reserve at 3:00
Cal. 9S68	2017-present	SBGR	Automatic	35	Yes	Larger size

See Also: Seiko 9S6x Family

Calibre	Start Year	End Year	Diameter (mm)	Complications
Seiko 9S61	2015	Current	28.40	Hacking Seconds, Hand Winding
Seiko 9S63	2019	Current	28.40	Hacking Seconds, Power Reserve Indicator
Seiko 9S64	2011	Current		Hacking Seconds
Seiko 9S65	2010	Current		Date, Hacking Seconds, Hand Winding, Quick Date Correction
Seiko 9S66	2010	Current		24 Hour Hand, Date, GMT Hand, Hacking Seconds, Hand Winding, Independently-Adjustable 24 Hour Hand, Quick Date Correction
Seiko 9S67	2006	2010	28.40	Date, Hacking Seconds, Hand Winding, Power Reserve Indicator, Quick Date Correction
Seiko 9S68	2017	Current		Date, Hacking Seconds, Hand Winding, Quick Date Correction