| Manufacturer | Seiko Time Corp. |
| Caliber Number | 11A |
| Base Caliber | Seiko 1104A |
| Movement Type | Mechanical, manual-wind |
| Diameter | 15.15mm x 13mm |
| Height | 3.5mm |
| Jewel Count | 17 or 21 |
| Beat Rate | 21,600 vph |
| Lift Angle | Unconfirmed |
| Power Reserve | Unconfirmed |
| Anti-Shock Device | Diashock |
| Hand Count | 2 |
| Functions | Central hours; central minutes |
| Country of Manufacture | Made in Japan or Singapore |
| Known Models | Vintage ladies Seiko watches (Add your watch to the comments below…) |
The Seiko caliber 11A is a basic mechanical 2-hander lady’s small size watch movement.
Not to be confused with the Seiko 11A Indicator men’s wristwatches.
Variations of 11A:
The 11A can be found with 17 jewels or 21 jewels, as well as made in Japan or made in Singapore.
Seiko 11A VS 1104A:
There is a similar caliber 1104A which the 11A is based on. The main difference is that the 1104A has a central seconds hand.
Additional Resources:
Submitted by member Rodders
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