Grail Watch Reference

A Reference Library for Watches from Grail Watch

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Seiko 9S5x Family

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BRANDS: Credor, Grand Seiko, Seiko, Shizukuishi Watch Studio

Production: 1998 – Current
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

Seiko introduced the flagship 9S family of movements in 1998 for their growing Grand Seiko line. Similar movements under the 8L name were later used in the Brightz, Credor, Galante, and Prospex lines. It was a modern 28,800 A/h movement with Seiko’s signature Magic Lever bi-directional winding system.

See also the Seiko 9S8x family of hi-beat movements.

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
Calibre Start Year End Year Diameter (mm) Diameter (ligne) Height (mm) Complications
Seiko 8L21 2003 2007 Hand Winding
Seiko 8L34 2000 2000
Seiko 8L35 2000 Current Date, Hand Winding, Quick Date Correction
Seiko 8L36 2011 Current 24 Hour Hand, GMT Hand, Hand Winding, Independently-Adjustable 12 Hour Hand
Seiko 8L38 2010 2015 Hand Winding
Seiko 8L75 2005 Date, Hand Winding, Quick Date Correction
Seiko 9S55 1998 2010 Date, Hacking Seconds, Hand Winding, Quick Date Correction