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You are here: Home / Movements / Seiko 9S55

Seiko 9S55

Last Update: February 9, 2020

Brand:Grand Seiko, Seiko, Shizukuishi Watch Studio
Family:
Seiko 9S5x Family
Height:
Jewels:26
Reserve: hours
Frequency:28,800 A/h
Winding:Automatic, Bi-Directional Automatic Winding
Diameter:
© 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
Balance
Balance at 1:30
Production: 1998 – 2010
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

Cal. 9S55 is an automatic movement with date produced by Shizukuishi Watch Studio for Grand Seiko. Launched in 1998, it was the first modern Grand Seiko mechanical movement and the basis for the Grand Seiko 9S5x movement family. It is a modern movement operating at 8 Hz (28,800 A/h) and is accurate ti -3/+5 seconds per day. Cal. 9S55 was phased out in favor of Cal. 9S65 in 2010.

Cal. 9S55 was based on the design of Cal. 4S35, the first modern high-end mechanical movement from Seiko. That movement, in turn, was developed from the design of the 1970 Cal. 5206, which had been retired in the 1970s and revived in 1992.

1970 Cal. 5206A
1992 Cal. 4S35
1998 Cal. 9S55
ProductionApplicationWindingJewelsNotes
8L212003-2007Brightz SAGLAutomatic24Similar to 9S51
8L342000Railway pocket watchManual20Small seconds
8L352000-presentBrightz SAGQ
Prospex SBDX
Prospex SLA
Automatic26Date, similar to 9S55
8L362011-presentCredor GCBZ
Galante SBLM
Automatic27GMT, similar to 9S56
8L382010-2015Galante SBLLAutomatic26Open Heart
8L75-2005Credor GCBRAutomatic26Date, similar to 9S55
9S511998-2009GS SBGRAutomatic24No date
9S542001-2010GS SBGWManual20No date
9S551998-2010GS SBGRAutomatic26Date
9S562002-2010GS SBGMAutomatic27GMT, no date
Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.

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