This is a 1960s Junghans ATO-MAT S clock that uses a transistor circuit to keep the oscillation of its balance wheel running (identical principle as in the Benrus Electronic Citation - just in bigger).
![](https://blog.noq2.net/content/images/atomat-01.jpg)
For its time a modern design with good quality components - it can still work today.
![](https://blog.noq2.net/content/images/atomat-02.jpg)
The "slide-in" clock module and dial.
![](https://blog.noq2.net/content/images/atomat-03.jpg)
Hands taken off.
![](https://blog.noq2.net/content/images/atomat-04.jpg)
The movement removed from the dial. On the left is a hack lever to stop the movement of the balance wheel and thus of the movement itself (this is not an OFF switch as the circuit will still consume battery power).
![](https://blog.noq2.net/content/images/atomat-05.jpg)
The Junghans W707 in-house movement.
![](https://blog.noq2.net/content/images/atomat-06.jpg)
No mainspring anywhere - all the power comes from the battery.
![](https://blog.noq2.net/content/images/atomat-07.jpg)
The electronic module is held in place by a single screw.
![](https://blog.noq2.net/content/images/atomat-08.jpg)
The huge balance wheel with two magnets and two counter-weights.
![](https://blog.noq2.net/content/images/atomat-09.jpg)
Teardown of the escapement mechanism.
![](https://blog.noq2.net/content/images/atomat-10.jpg)
A side view of the wheel train. As all the "drive" comes from the balance wheel, good lubrication is essential for good timekeeping here.
![](https://blog.noq2.net/content/images/atomat-11.jpg)
Another view of the wheel train.
![](https://blog.noq2.net/content/images/atomat-12.jpg)
The escape wheel engages directly with the balance wheel - a simple construction with a minimal number of parts.
![](https://blog.noq2.net/content/images/atomat-13.jpg)
The parts before reassembly.
![](https://blog.noq2.net/content/images/atomat-14.jpg)
Cleaned wheels - somewhat too much oil here...sorry.
![](https://blog.noq2.net/content/images/atomat-15.jpg)
The movement back in action.
![](https://blog.noq2.net/content/images/atomat-16.jpg)
Done and keeping time.
greetings noq2
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