Early 2-knob Rally Clock
The rally clock with oscillator was used in the early 70’s in Japan and available here in the US through the Datsun dealer as a special order. The oscillator box was separate from the clock, but attached by a wiring harness. The oscillator supplies power and timing for the motor in the clock body that runs 24/7. Without the oscillator the clock will not work. If you don’t have a working oscillator your clock is a nice table decoration.
There are four distinct functions of this rally clock for the user.
1-Reset the sweep hand to the 12 o’clock position.
2-Stop the sweep hand in place.
3-Move the inner clock dial.
4-Set the clock time.
There is also two oscillator versions, early and late, and both look identical. The early version is identified as having a high pitched or humming sound which comes from a tuning fork. This is one of the most unique oscillator arrangements and for those who remember the Bulova Accutron of the 60’s this is a very close copy.
The later version of this oscillator box eliminated the tuning fork by replacing it with a quartz oscillator. In addition 50% of the components of the original oscillator box were eliminated by integrated circuits which were proprietary to JECO. The advantage of this late box is that it is very simple and not as fragile as the earlier version(tuning fork). However, parts are not available for this box. Oscillator boxes are also interchangeable with either the early or late clock body’s, for 240z or 280z Rally clocks.
Oscillators can hum, but that doesn’t mean they will keep time.
Note: The 2-knob clock is noisy due to the motor in the clock that runs 24/7