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You are here: Home / Movements / Seiko 9S85

Seiko 9S85

Last Update: February 1, 2020

Brand:Grand Seiko, Seiko, Shizukuishi Watch Studio
Family:
Seiko 9S8x Hi-Beat Family
Height:6.0 mm
Jewels:37
Reserve:55 hours
Frequency:36,000 A/h
Winding:Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding
Diameter:28.40 mm
© Grand Seiko  Complications:Date, GMT Hand, Hacking Seconds, Hand Winding, Independently-Adjustable 24 Hour Hand, Quick Date Correction
Hands:Central 24 Hour Hand, Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00
Distinguishing Technical Characteristics
Central-Rotor Automatic
Clockwise Balance Cock
Screw Regulator
Balance, Balance at 2:00
Production: 2009 – Current
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s
This 2010 image of Cal. 9285 from Seiko shows the changes in decoration over the years

Grand Seiko Cal. 9S85 is a high-beat automatic movement with date. It is closely related to Cal. 9S86, which adds an independently-adjustable central GMT hand. It was introduced in 2009 and remains in production as of 2020.

Cal. 9S85 features a proprietary Spron 610 alloy for the mainspring, with improved impact and magnetic resistance. The escapement is created using MEMS technology for precision. The mainspring is constructed of the Spron 530 alloy for higher torque and increased power reserve. The movement is reportedly resistant to magnetic fields to 4,800 A/m.

Cal. 9S85 is used in the Grand Seiko Hi-Beat Automatic SBGH series of watches. The similar 8L55 is used in the Prospex SLA Hi-Beat dive watch line. In 2018, Grand Seiko introduced a V.F.A. version of Cal. 9S85 tuned to deliver -1/+3 seconds accuracy.

CalibreProductionSpeedJewelsFunctionsModels
Cal. 8L552015-present36,00037DateProspex SLA/SBEX
Cal. 8L882008-200943,20041Power reserveCredor GBBX998
Cal. 9S852009-present36,00037DateGrand Seiko SBGH
Cal. 9S862014-present36,00037Date, GMTGrand Seiko SBGJ

Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.
Manufacturer Link

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