|Brand:||Grand Seiko, Seiko, Shizukuishi Watch Studio|
|Winding:||Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding|
|© Seiko||Complications:||Date, Hacking Seconds, Hand Winding, Power Reserve Indicator, Quick Date Correction|
|Hands:||Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00, Power Reserve Pointer at 3:00|
|Distinguishing Technical Characteristics|
Clockwise Balance Cock
|Production: 2006 – 2010|
Cal. 9S67 was the first “three days” watch movement from Grand Seiko and became the basis for the modern Seiko 9S6x movement family. It is an automatic movement with date and a power reserve indicator, both placed at 3:00 on the dial. Unlike the later Cal. 9S63, the power reserve indicator is placed close to the center of the dial.
Cal. 9S67 was used in the Grand Seiko SBGL series of watches from 2006 through 2010.
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
|Cal. 9S63||2019-present||SBGK||Manual||33||No||Power reserve at 3:00|
Small seconds at 9:00
|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 FamilyImages are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.