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Seiko 6100

The “Seikomatic 5” 6100 series was a family of mechanical watch movements from Seiko in the 1960's and 1970's.

Produced from 1967 through 1974, the 6100 family was used in many high-end Seiko watches. It was available in both regular 21,600 A/h and high-beat 36,000 versions and both manual winding and automatic versions.

The Hi-Beat 61GS models, introduced in 1968, upstaged the slower 62GS models. That movement was retired in 1969, with the 6100 becoming the high-end Grand Seiko movement. But producing these movements was highly labor-intensive, so Seiko began mechanizing the next year. The 5600 calibre family quickly proved itself for reliability and quartz movements boasted better accuracy, leading to the demise of the 6100 by 1974.

Seiko “resurrected” the 6159A movement in 1975, creating the 6159B for their 600M diver. There is little parts interchange between this later movement and earlier members of the family. It features larger pins to attach the heavier hands of the diver, along with different balance cock and regulating pins similar to the Seiko 4S24.

6110A1971Railroad Watch
Automatic6105A1968Quickset date
6105BQuickset date, hacking
6106A, 6106B, 6106C1967Day, date, hacking
6109ADay, date, small rotor
6117A1968Quickset date, GMT 24 hour
6117BQuickset date, GMT 24 hour, hacking
6118AQuickset date
6119A, 6119B, 6119C1970Day, date
6138A, 6138B1970Chronograph, hour counter, quickset day and date
6139A, 6139B1968Chronograph, hour counter, quickset day and date
360006145A1968Date, Grand Seiko
6146A1968Day, date, Grand Seiko
6155A1971Date, Grand Seiko Special
6156A1970Day, date, Grand Seiko Special
6159A1967Quickset date, Diver 300
6159B1975Quickset date, hacking, Diver 600
6185A1969Grand Seiko Veri Fine Adjusted
6185BGrand Seiko Veri Fine Adjusted, hacking
6186A1972Day, date, Unruhstop, Grand Seiko Veri Fine Adjusted

See Also




  • Diameter 12 ligne (27.0 mm), H 5.25 mm
  • 17 jewels
  • 21,600 A/h
  • Power reserve 46 Hours

Production period:

seiko_6100.txt · Last modified: 03.07.2022 15:38 by

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