Seiko 11A

 
Seiko 11A

Seiko 11A

Description

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 jewels

version with 17 jewels

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

Seiko 11A dial side

Seiko 11A dial side

Technical data

Manufacturer:Seiko
Caliber:11A
Number of jewels:17/21
Escapement:Pallet lever
Shock protection(s): Diashock (Seiko)
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:yes
Adjust mechanism:Hairspring key
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, center minute wheel
  • mainspring barrel
Winding mechanism:yoke winding system
Setting lever spring:4 hole(s)
Functions:hour, minute
A/h:21600
Size:5 3/4 x 7'''

Usage gallery

Seiko ladies' watch

Seiko ladies' watch

Seiko ladies' watch model 3380

Seiko ladies' watch model 3380

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