I think in Volksworld a few months ago Rikky James was talking about one he had found and what a rare clock it was, the photo was the same clock as yours.
I have one in my late late bay and the instructions in german ,it does lite up ,but that is as far as I got... ;D Nice find you little treasure hunter... ;D
Babel fish from OCR software (not sure if this makes much sense but here you go): do you have wires hanging out the back or terminals? if so how many?