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Seiko 68 Family

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BRANDS: Credor, Daini Seikosha, Seiko, Shizukuishi Watch Studio

Production: 1969 – Current
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

Seiko’s 68 stream is a family of ultra-thin hand-winding watch movements produced since 1969. Originally created by Daini Seikosha, the descendants of Cal. 68A continue in production as of 2020 and remain an impressive technical accomplishment.

All members of the Cal. 68 family operate at 21,600 A/h and have a 37 hour power reserve. All are regulated to -15/+25 seconds per day accuracy.

The original Cal. 68A was only produced for a short time following its 1969 introduction, but Cal. 6810 lasted all the way to 1978. It was squared off at the sides for a near-tonneau shape. This fit in the square and rectangular watches that were popular at the time.

This page from the 1993 Seiko catalog shows Cal. 6810 as it returned to the lineup in the SCVL watch series

This would have been the end of the Cal. 68 family if Seiko had not brought the movement back into production in 1991 for a special limited-edition “U.T.D.” watch for the 110th anniversary of the company. It re-entered regular production by 1993, continuing in use in the simple SCVL series until 1998.

Cal. 6810 was hand-built from 1973 through 1998
Cal. 6870 was launched in 1993 as a refresh of the original design
Cal. 6890 is a redesign of the movement, relocating the balance and featuring new bridges
Cal. 6830 was Seiko’s first-ever tourbillon movement
Cal. 6898 has a small seconds subdial at 6:00
Cal. 6899 is a skeletonized version

Also in 1993, a new updated version was introduced, Cal. 6870, with better finishing for use in Credor watches. Although still hand-built, the future 68 series would be focused on this high-end brand.

In 1996, the skeletonized Cal. 6899 was released, with a complete redesign. For the first time since 1969, the movement was round. This allowed the balance to be relocated opposite the winding stem, and the bridges were completely changed. All future versions of the movement would use this new architecture. Cal. 6898 is the next to appear in the catalog, bringing a small seconds subdial in 2005. Next came Cal. 6890, a simple movement with no running seconds, in 2009.

The newest member of the Cal. 68 family is perhaps the most important. Introduced in 2016, Cal. 6830 is Seiko’s first tourbillon. Replacing the balance at 9:00 on the dial, the tourbillon includes many innovations to be constructed so thin and with so few parts.

Seiko 68 Family

CalibreProductionJewelsModelsNotes
68A1969-197226
68101973-1978
1991-1998		22HDF/HTB/ATB/CDF
SCVL		Tonneau shape
68302016-current22GBCCCredor tourbillon
68701993-current22GBAQ/GCAQCredor tonneau
68902009-current22GBBYCredor
68982005-current26GBBE/GCBECredor small seconds
68991996-current26GBBDCredor skeleton

Calibre Start Year End Year Diameter (mm) Diameter (ligne) Height (mm) Complications
Seiko 6810 1973 1998 25.60 11.5 1.98
Seiko 6830 2016 Current 25.60 11.5 3.98 Tourbillon
Seiko 6870 1993 Current 25.60 11.5 1.98
Seiko 6890 2009 Current 25.60 11.5
Seiko 6898 2005 Current 25.60 11.5 1.98
Seiko 6899 1996 Current 25.60 11.5 1.98

Seiko 6810
Seiko 6830
Seiko 6870
Seiko 6890
Seiko 6898
Seiko 6899