Cessna electric panel clock

[dcannon]

What is this hole for on the back? I don't have one at hand right now to get a light on it.

I've got one that will run if I give it a tiny bit of twist pressure on the adjustment knob. Otherwise with 12V it doesn't run. Im guessing it's just enough gummed up internals that the motor won't scoot.

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[6643]

Most of those old clocks are actually wind up mechanisms with a little electric solenoid that winds it every time it unwinds enough to close a set of contacts.

Not sure about the hole, maybe an adjustment screw?

[edidin]

Easy to get the wind-up clock from eBay or new ones from Waltham Clock. Very satisfying bit of mechanical kit.

[dcannon]

Thank you both. I agree mechanical is more satisfying. I went with a Wakmann. I did not know about Waltham - great find!