Just to close this thread out:
Playing around with the clock off the parts car gave me the confidence to try to fix the clock in the 220d that I inherited from my dad. I am trying to keep the original parts to the car when possible. Anyway, following the process described in the link I put in post 5 of this thread, I put a diode and capacitor into the circuit. I cleaned the contacts. And then washed and lubed the clock. Now I will let it run a few days to adjust it to read the correct time. But it is really quite simple to do this clock repair once you have done it before. Anyway, thanks everyone for all your suggestions. I am excited to have an actual functioning clock and for it to be the same one that came with the car 45 years ago. I will have lost one of key excuses for being late. Oh well.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).