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You are here: Home / Movements / Seiko 4S36

Seiko 4S36

Last Update: February 5, 2020

Brand:Seiko
Family:
Seiko 4S Family
Height:
Jewels:31
Reserve:50 hours
Frequency:28,800 A/h
Winding:Automatic, Bi-Directional Automatic Winding
Diameter:25.60 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: 2007 – 2013
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

Cal. 4S36, made from 2007 through 2013, 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. 4S36 is similar in design to Cal. 4S76, though it lacks the upscale finishing and regulation of that movement. Unlike most 4S movements, Cal. 4S36 has 50 hour power reserve.

Unlike the related Cal. 4S27, 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. 4S36 was used originally in the Seiko SARN “Luxury Power Reserve” watch series from 2007 through 2013. It also made a short appearance in The Seiko “Complicated” SAEN001 in 2012.

  • 2012 Seiko Complicated SAEN001
  • 2007-2013 Seiko Luxury Power Reserve SARN001
  • 2007-2013 Seiko Luxury Power Reserve SARN003

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

External Link

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