These unusual movements are characterised by:
- Balance Wheel
- Quartz Control (no contacts)
The oscillations of the balance wheel are synchronised by the pulses from the quartz crystal. Thus, the balance wheel drives the wheel train. An unusual beast; not many manufacturers produced these quartz-controlled balance wheel movements, only Record-Golay, Porta, Citizen, Luch and Timex.
Three examples of the unusual Moving Coil, Quartz-Controlled movement type are shown below: