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You are here: Home / Families / Seiko 6S Family

Seiko 6S Family

Last Update: August 5, 2019

BRANDS: Credor, Seiko, Shizukuishi Watch Studio

Production: 1998 – 2016
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

A key part of Seiko’s resurgence in modern times was the Cal. 6S family of automatic chronograph movements. Although rarely seen, they demonstrated the company’s expertise along with the Cal. 9S movement family introduced at the same time.

Seiko called back many original watchmakers from retirement to develop the “phoenix” Cal. 6S78 movement. On introduction in 1998, it helped re-establish the company’s bona fides and was a halo offering for the domestic Credor brand. It is thoroughly modern, with a vertical clutch and column wheel, yet classical in look. It has a 6-9-12 subdial arrangement like the popular Valjoux 7750 family. Many models feature a date or power reserve complication as well, and hand-winding versions were also produced.

  • 6S78 (1998-2004) – 34 jewels, automatic, date, Credor
  • 6S28 (2005-2013) – 34 jewels, automatic, date, Credor
  • 6S37 (2001-2016) – 40 jewels, automatic, date, power reserve, Prospex/Brightz/Credor
  • 6S77 (2003-2005) – 40 jewels, automatic, date, power reserve, Credor
  • 6S96 – 38 jewels, automatic, no date, power reserve
  • 6S74 – 35 jewels, hand winding, no date, power reserve
  • 6S99 (2002-2005) – 35 jewels, hand winding, no date, power reserve, skeletonized

Calibre Start Year End Year Diameter (mm) Diameter (ligne) Height (mm) Complications
TAG Heuer 1887 2010 Current 29.3 13 7.13 2-Button, 8-Column Chronograph, Chronograph, Column Wheel Chronograph, Date, Quick Date Correction

TAG Heuer 1887

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