View source for Seiko 6600

The '''6600''' series was a family of mechanical watch movements from [[Seiko]] in the 1960's.

Produced from [[1961]], the 6600 family was the basis of many later Seiko movements, including the [[Seiko 6100|6100 family]].  It ran at 18,000 A/h and used an [[automatic]] winding mechanism, Seiko's [[Magic Lever]]. The family was available in varying jewel counts: 17, 19, or 21.

The first member of the lineup was the [[1961]] 6601A. Available with 17, 19, or 21 jewels and measuring 5.45 mm high, this basic movement nevertheless had a sophisticated automatic winding system. It was replaced by the 6601B later with unknown modifications. The 6606B and 6619A were launched in [[1965]] with a non-[[quickset]] day and date wheel and 21 jewels. It was not until the [[1968]] 6602B that Seiko reached a 45 hour power reserve, and this movement was 1 mm thinner.

* Hand-wind - Officially 23.6 mm in diameter
** 436/4361/66A (1960) - 23.6 or 24.1 mm, hand-wind
** 66B (1960) - 23.6 or 24.1 mm, hand-wind
** 957/6602B - 27.6 or 28.1 mm, hand-wind, dater Cal 66
** 6618A (1966) - 24.1 mm, hand-wind
** 6640A (1961) - 24.1 mm, hand-wind
** 6642A - hand-wind
** 6659A (1964) - 24.1 mm, hand-wind
** 6660A - 24.1 mm, hand-wind
* Automatic
** 6601A (1961) - 27.6 or 28.1 mm, automatic
** 6601B - 27.6 or 28.1 mm, automatic
** 410?/6606B (1963) - 27.6 or 28.1 mm, automatic, day/date
** 6619A (1964) - 27.6 or 28.1 mm, automatic
** 245/2451
** 790
* 6605 (1962)
* 660

{| border="1" cellpadding="3" style="border-collapse:collapse;"
!Winding!!Speed!!Model!!Year!!Jewels!!Power Reserve!!Notes
|-
|rowspan=3|Automatic||rowspan=3|18000||6601A, 6601B||1961||17, 19, 21||38 hours||
|-
|6602B||1968||17||45 hours||Date
|-
|6606B, 6619A||1965||21||38 hours||Day and date
|}

{{WD|
'''Description:'''
:[[Automatic]] movement
:[[Kif]]-[[Duofix]] escapement settings

'''Functions:'''
:Hours, minutes, [[central seconds]]
:Optional day and date

'''Data:'''
:Diameter: 12.25 ligne (27.6 mm), H: 4.45 or 5.45 mm
:17 or 21 [[jewels]]
:18,000 A/h
:Power reserve: 38 to 45 Hours

'''Production period:'''
:[[1961]]-
}}

[[Category:Movements]]
[[Category:Automatic movements]]
[[Category:Seiko calibres|66]]
[[Category:Suwa Seikosha calibres|66]]