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You are here: Home / Movements / Seiko 4S76

Seiko 4S76

Last Update: February 5, 2020

Brand:Credor, Seiko
Family:
Seiko 4S Family
Height:
Jewels:31
Reserve:50 hours
Frequency:28,800 A/h
Winding:Automatic, Bi-Directional Automatic Winding
Diameter:26.50 mm (11.5 ligne)
  Complications:24 Hour Hand, Date, Date by Pointer, Day, GMT Hand, Hacking Seconds, Hand Winding, Independently-Adjustable 24 Hour Hand, Power Reserve Indicator, Quick Date Correction, Quick Day Correction, Retrograde Day
Hands:Central 24 Hour Hand, Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Pointer at 6:00, Power Reserve Pointer at 9:30, Retrograde Day Pointer at 2:30
Distinguishing Technical Characteristics
Clockwise Balance Cock
Screw Regulator
Balance
Balance at 4:30
Barrel at 12:00
Production: 2004 – 2010
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

Cal. 4S76, made from 2004 through 2010, is perhaps the most complicated automatic movement ever produced by Seiko. Complications include retrograde day, date by pointer, retrograde power reserve indicator, and independently adjustable 24-hour hand. It was the final development of the Seiko 4S family, which itself was derived from the historic Seiko 52 stream of movements. Cal. 4S76 is similar in design to Cal. 4S36, though with upscale finishing and regulation for use in Credor watches. Unlike most 4S movements, Cal. 4S76 has 50 hour power reserve.

Unlike the related Cal. 4S77, which resembles a chronograph, this movement has a balanced look emphasizing the dual retrograde pointers on each side of the tall quadruple hand stack. A second crown at 2:00 on the dial adjusts the central 12 hour hand in 1-hour increments, leaving the stacked 24 hour hand as “home time.”

  • A retrograde pointer at 2:30 shows the day on a “fan”
  • A subdial at 6:00 shows the date using a small pointer
  • A retrograde pointer at 9:30 shows the power reserve clockwise on a “fan”

Cal. 4S76 was used the Credor Node GCBT and GBBT watch lines from 2004 through 2010.

  • 2004 Credor Node GBBT999
  • 2004-2009 Credor Node GBBT998
  • 2007-2010 Credor Node GBBT994
  • 2004-2006 Credor Node GCBT999
  • 2005-2009 Credor Node GCBT998
  • 2004-2008 Credor Node GCBT997
  • 2004-2007 Credor Node GCBT995
  • 2004-2010 Credor Node GCBT993
  • 2007-2009 Credor Node GCBT989
  • 2007-2010 Credor Node GCBT987

Complicated Seiko 4S Movements

After 2000, Seiko had more diverse mechanical movements to choose from. The 4S family was moved upmarket as a base for modules to use in complicated upscale watches. The last 4S movement was retired in 2015.

ProductionWatchWindingJewelsNotes
4S272003-2007SAGNAutomatic28Retrograde day at 2:00
Date pointer at 6:00
GMT subdial at 9:00
4S292003-2007SAGNManual29Small seconds at 6:00
Retrograde power at 9:00
4S362007-2013SAEN
SARN
Automatic31Independent 24 hour hand
Retrograde day at 2:00
Date pointer at 6:00
Retrograde power at 9:00
4S762004-2010GBBT
GCBT
Automatic31Independent 24 hour hand
Retrograde day at 2:00
Date pointer at 6:00
Retrograde power at 9:00
4S771996?
2000-2005
GCBGAutomatic28Retrograde day at 2:00
Date pointer at 6:00
GMT subdial at 9:00
4S791998-2015GBAY
GCAY
Manual31Small seconds at 6:00
Retrograde power at 9:00
Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.
External Link

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