Re: IBM Factory Clock
After looking at the link in post#4 it has made me think it is 6 volts pulsed at one minute with a far eastern board that looks better made than a quartz module that is very unlikely to work with the original hands.
The third wire is likely to be an earth.
There will be little difference in cost for a pulser board and it will almost certainly be adjustable for differing pulse rates.
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