Ladies quartz. Not popular other than as a curiosity.
These are difficult to repair due to lack of parts. The chip factories long since crumbled to dust. Any design plans shredded.
Such watches were well made. Designed to be repaired unlike the modern plastic movements. More mechanical than electronic. Setting them can be tricky. Unlike a mechanical and modern quartz, the stepper motor had difficulty overcoming the frictions of the traditional set mechanism. The wheel train powered from the escape side. The setting was done with button presses or pressure on the stem.
Static electricity and dust could stop them forever. Changing a battery and gaskets outside a clean room can be risky as well. For the most parts movements were swapped out.
I like them, Mostly as a challenge. In theory a modern microcontroller (nano controller?) Such as an AVR tiny 85 in a chip on die (COD) package could overcome the timer chip. Stepper motors are more of a problem. These seem to develop open circuits with the motor not stepping at all.
Any funds spent fixing them is like setting 100 dollar bills on fire and dropping them out the window.
