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Seiko 11A


Seiko 11ASeiko 11A


Besides the familiar selfwinding and large mens' watches' movements, Seiko also offeres tiny ladies' movements for their own small ladies' watches.

Such a movement is the Seiko Caliber 11A. It is technically unspectacular, since it is constructed like any other contemporary ladies' movement of that era. But in terms of quality there are noteable differences, since it was offered in different versions:

The version with 17 jewels already contained two pressed-in chatons for the anchor wheel and the third wheel. The version with 21 jewels even countained four (and maybe even more on the dial side?) shock-protected chatons. Such an impressive number of shock protections is really unique.

version with 17 jewelsversion with 17 jewels

Common for all versions is the four-legs balance and its inhouse Diashock proctection.

Seiko 11A dial sideSeiko 11A dial side



 Technical data

Number of jewels17,21
EscapementAnchor with pallets
Shock protection(s)Diashock (Seiko)
Balance cock directioncounterclockwise
Hairspring studmoveable
Regulator typeHairspring key
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel, Center wheel
Mainspring barrel
Winding mechanismyoke
Setting lever spring4 holes
FunctionsHour, minute
Beats per hour21600
Size53/4 x 7'''
Seiko 11ASeikoSeiko11A5 3/4 ''' 7''''''Seiko 11A17,21 Jewels, 5 3/4 x 7'''''', 21600 A/h



Usage gallery

Seiko ladies' watchSeiko ladies' watchSeiko ladies' watch model 3380Seiko ladies' watch model 3380



The model 3380 watch and its movement were kindly donated by U.Ströbel-Dettmer. Thank you very much!