ETA 2551
Description
The ETA 2551 is the selfwinding brother of the caliber 2541. With a diameter of only 7 3/4 lignes it is a truely tiny ladies’ watch movement, which is also feature-rich. It offers the well known and almost two decades familiar bidirectional winding system as well as a fast switching date mechanism, which can be corrected semi-fast.
Compared to its predecessors like the ETA 2365, you see, that it was produced a little cheaper. The “click spring” of the winding system is now just an ugly kind of wire and the screw balance was replaced by a simple three-leg screw-less balance.
As usual, this ETA movement also contains an (hidden) yoke winding system and an indirectly driven minute hand, which allowed a significantly larger diameter of the balance and thus a higher precision.
This movement was not used for a very long time and rather quickly surpassed by the caliber series 2651, of which the latter one is still used today!
removed selfwinding mechanism
ETA 2551 dial side
Technical data
| Manufacturer: | ETA |
| Caliber: | 2551 |
| Size: | 7 3/4''' |
| A/h: | 21600 |
| lift angle: | 51° |
| Number of jewels: | 21 |
| Escapement: | Pallet lever |
| Balance types: |
Nickel anular balance |
| Shock protection(s): |
Incabloc |
| Balance bearing / direction hairspring: | Clockwise |
| Moveable stud: | yes |
| Adjust mechanism: | Long regulator arm |
| Construction: |
|
| Winding mechanism: | yoke winding system |
| Features: |
|
| References: |
Flume: K3 151 |
| Mentioning in literature (years): | 1968 - 1971 |
| Documentation (years): | 1970 |
Usage gallery
Anker 100 S ladies' watch