Shanghai ZSE Z-A
Description
The chinese ZSE Z-A was the first incarnation of the “First National Standard Movement”, the first standardized mens’ watch movement. It was made between 1972 and 1974, before it was superseded by the million-seller ZSH series.
The construction is very traditional and easy serviceable - the large four-leg ring balance contains a thick and rugged (hard to break accidentially) hairspring, which is connected to a moveable hairspring stud and whose effective length can be regulated directly on the hairspring key. The balance beats with 21600 A/h and is shock proctected. The shock protection system is made in China and its springs were available in many different shapes, starting from an Incabloc-like type to a “four leaf clover”.
Shanghai ZSE Z-A dial side
On the dial side, you see, whan was above described as “four leaf clover”: The shock protection spring. It reminds a bit of a KIF flector. Otherwise, there are no surprises on the dial, and of course, this movement uses a yoke winding system.
Technical data
| Manufacturer: | Shanghai |
| Caliber: | ZSE Z-A |
| Size: | 11 1/4''' (measured: 25,4mm) |
| A/h: | 21600 |
| Number of jewels: | 17 |
| Escapement: | Pallet lever |
| Balance types: | Nickel anular balance |
| Shock protection(s): | China (different types) |
| Balance bearing / direction hairspring: | Counterclockwise |
| Moveable stud: | yes |
| Adjust mechanism: | Hairspring key |
| Construction: |
|
| Winding mechanism: | yoke winding system |
| Setting lever spring: | 3 holes |
| Features: |
|
| References: | Flume: - |
Links
* [Micmicmor Vintage Watch: Shanghai 7 Series](http://micmicmor.blogspot.com/2008/01/shanghia-7120-7series.html)
This movement was kindly donated by [Klaus Brunnemer](index.php?option=com_content&view=article&id=62:donated-movements-of-klaus-brunnemer&catid=10&lang=en-GB&Itemid=201). Thank you very much!