Seiko calibres

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Seiko is one of the few completely-integrated manufactures of watches.

Hand Winding

As with Seiko's watches, there were two "streams" of movements from the two Seiko watch companies, Suwa and Daini.

Automatic

As with Seiko's watches, there were two "streams" of movements from the two Seiko watch companies, Suwa and Daini, and frequently two more streams, 26 mm and a larger size nearer to 28 mm.

Basic Automatic

Seiko's basic automatics are marked by slower speed (18,000 or 21,600), less features than contemporaries (hacking, hand-winding, complications), fewer jewels, and use in budget models.

  • Suwa large
    • Seiko 245/660/790/2451/6600 (1961-1967) - Suwa, 28.1 mm, 17, 19, or 21 jewels, 18,000 A/h, used in Sportsmatic and SilverWave
    • Seiko 6300 (1976-1988) - Suwa, 27.4 mm, 17/21/23 jewels, 21,600 A/h, used in Five
  • Daini small
    • Seiko 7000 (1968-1990's) - Daini, 26 mm, 17/21 jewels, 21,600 A/h, used in Automatic, Five Sports, Chronograph, Actus
    • Seiko 7S26 family (1996-Present) - 21/23 jewels, 21,600 A/h, used in Five
    • Seiko 4R35 family (2010-Present) - 23/24 jewels, 21,600 A/h
  • Alarm

Midrange Automatic

Seiko's midrange movements are characterized by better performance and use in higher-end models.

  • Suwa Large
  • Daini Large
    • Seiko 820/7600 (1963-1969) - Daini, 28 mm, 17, 23, or 25 jewels, used in Sportsmatic Deluxe
  • Daini Small
    • Seiko 5100 (1967-1971) - Daini, 26 mm, 23/27/30/33 jewels, used in Seikomatic, New Five, Presmatic
    • Seiko 4R15 family (2008-Present) - 22 jewels, 21,600 A/h, used in Superior, SRP
    • Seiko 6R15 family (2006-Present) - 23/29/31 jewels, 21,600 or 28,000 A/h

High-End Automatic

Automatic Chronograph

  • Seiko 6139 family (1969-1979) - Suwa, 27.4 mm, 21,600 A/h, automatic column wheel, vertical clutch chronograph
  • Seiko 7015 family (1971-1990's) - Daini, 26 mm, 21/23 jewels, 21,600 A/h, cam-switched chronograph
  • Seiko 6S78 family (1998-Present) - 34/35/40 jewels, 28,800 A/h, column wheel chronograph
  • Seiko 8R28 family (2008-Present) - 34 jewels, 28,800 A/h, 3-clutch column wheel chronograph

Spring Drive

Quartz

  • Seiko 7A (1982-) - The first analog quartz chronograph
  • Seiko 8J (-Present) - Compact high-end quartz
  • Seiko 9F (1993-Present) - High-end quartz

See Also