|Brand:||Grand Seiko, Seiko, Shizukuishi Watch Studio|
|Winding:||Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding|
|© Grand Seiko||Complications:||Date, Hacking Seconds, Hand Winding, Quick Date Correction|
|Hands:||Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00|
|Distinguishing Technical Characteristics|
Clockwise Balance Cock
|Production: 2010 – Current|
Cal. 9S65 is an automatic movement with date from Grand Seiko. It is the most common mechanical movement in the line, and is found in the popular SBGR series of watches. Cal. 9S65 has been in production since 2010.
Unlike the predecessor Cal. 9S55, which used the Seiko Magic Lever system, this movement uses a conventional reverser wheel for bi-directional automatic winding. This generation also features MEMS technology for the pallet fork and escape wheel.
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.