Seiko 11A
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| Seiko 11A |
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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.
Common for all versions is the four-legs balance and its inhouse Diashock proctection.
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| version with 17 jewels |
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| dial side view |
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Technical data
| Manufacturer | Seiko |
| Caliber | 11A |
| Number of jewels | 17,21 |
| Escapement | Anchor with pallets |
| Shock protection(s) | Diashock (Seiko) |
| Balance cock direction | counterclockwise |
| Hairspring stud | moveable |
| Regulator type | Hairspring key |
| Movement construction | Fork
Escapement wheel, Fourth wheel, Third wheel, Center wheel
Mainspring barrel |
| Functions | Hour, minute |
| Beats per hour | 21600 |
| Size | 53/4 x 7''' |
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| Factsheet |
Usage gallery
