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Steve,
I don't think these clocks need voltage regulation. The time is regulated by the movement and all the voltage does is fire the winding solenoid. Maybe it was running good inside the house on the bench where it was warm and constant temp? Does the mechanism need a cleaning and lube, something a watch shop might be able to do? I may be all wrong here as I've never opened up the VDO clock but I have worked on old GM clocks.
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