Seiko 5600

Suwa Seikosha produced the 5600 series of high-end automatic watch movements for Seiko in the 1960's and 1970's.

This line was used in various Lord Matic, King Seiko, and Grand Seiko models from 1968 through 1976. It appeared first in the 1968 Lord Marvel, next in 1969 in the King Seiko 56KS, and finally in 1970 in the Grand Seiko 56GS. It was also used in two other Seiko models - the Seiko Duotime and Seiko Chronometer.

Unlike previous Grand Seiko movements, production of Calibre 5600 was highly automated. This made the movements cheaper and helps to this day since parts are more plentiful. But the speed of the movement was reduced from "Hi-Beat" 36,000 A/h of its predecessors.

The 5600 family was introduced in 1968 for the Lord Matic and first appeared in King Seiko guise the following year. This was the first Suwa movement used in the Daini King Seiko line.

Variants

The 5600 family was produced in four grades and with three complication sets:

• Grades:
  • Lord Matic - 560x - 20-25 jewels, unregulated, 21,600 A/h
  • King Seiko - 562xA - 25 jewels, unregulated, 28,800 A/h
  • King Seiko Regulated - 562xB - 25 jewels, regulated, 28,800 A/h
  • Grand Seiko - 564x - 25 jewels, regulated, 28,800 A/h
• Complications:
  • 56x1 - No complications
  • 56x5 - Date only
  • 56x6 - Day and date
  • 5619 - Dual time (Lord Matic and Duotime only)

See Also

• Seiko 6800 - Another ultra-thin movement from that era

Speed	Movement	Date	Jewels	Power Reserve	Complications	Notes
21600	5601A	1968-1978	23	47 hours		Lord Matic
	5605A	1968-1971	25	47	Date	Lord Matic
	5606A	1968-1978	23/25	47 hours	Day, date	Lord Matic
	5619A	1972-1974	25	47	Date, dual time 12h	Lord Matic, Duotime
28800	5621A, 5621B	1969-1973	25	47		King Seiko
	5625A, 5625B	1968-1974	25	47	Date	King Seiko, Chronometer
	5626A, 5626B	1968-1973	25	47	Day, date	King Seiko, Chronometer
	5641A	1971-1973	25	47		Grand Seiko
	5645A	1970-1974	25	47	Date	Grand Seiko
	5646A	1970-1975	25	47	Day, date	Grand Seiko

Applications

• Lord Matic
  • 1968-1978 - 5601A
  • 1968-1971 - 5605A
  • 1968-1978 - 5606A
  • 5262 (Lord Matic De Luxe)
• King Seiko 56KS
  • 1969-1973 - 5621A/5621B
  • 1968-1974 - 5625A/5625B
  • 1968-1973 - 5626A/5626B
• Seiko Chronometer
  • 1969-1973 - 5625B
  • 1969-1974 - 5626B
• Grand Seiko 56GS
  • 1971-1972 - 5641A
  • 1970-1973 - 5645A
  • 1970-1974 - 5646A
• Seiko Duotime
  • 1972-1974 - 5619A

External links

• Qualified for Time Travel: SEIKO 4S36 GMT Retrograde SARN001
• Private Collection - Grand & King Seikos

Description: Automatic movement Functions: Hours, minutes, central seconds Automatic winding Quickset date Quickset day Dual time Data: Diameter: 11.5 ligne (25.6 mm), H: 4.35 mm 20, 23, 24, or 25 jewels 21,600 or 28,800 A/h Production period: 1968-1976