This is one of my personal holy grail watch. Cyma Time-O-Vox! I have been looking for one since I discovered Cyma. This example is not working, but looks to be in decent condition.

This alarm has a single barrel construction. Here you can see the upper timing wheel. When you wind the mainspring the timing wheel automatically resets. When the alarm is engaged the timing wheel will allow the alarm to ring for 6 seconds before stopping.

The Hour wheel is tensioned downwards towards the alarm wheel. When the alarm wheel pin aligns with the hour wheel slot, it moves downwards releasing the hammer lock.

Movement back in the case looking great. This must be one of the prettiest alarm movements ever made.
Setting instructions:
Setting the time: 1. Press in the upper button 2. Pull out the crown 3. Set the time 4. Push in the crown back in.
Winding: 1. Press in the upper button 2. Wind the watch.
Setting Alarm: 1. Press in the lower button 2. Set desired alarm time using the crown 3. Push the upper button until both buttons are in the middle position.
Disengaging alarm: Press in lower button.
Winding alarm: Wind the watch normally.
This setting mechanism is not the smoothest. If the alarm has rung, it sometimes does not want to wind. This is solved by engaging and disengaging the stem into setting position. I’m not sure if this is due to the engineers trying to do too much with a single winding stem, or if it’s wear and tear causing this issue. Nevertheless I still think it’s a great watch.