Seiko 6S Family

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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