Yeah. I always wondered if the clock once glowed in the night. Replaced it with a spare bulb, and then did so with LED's when i changed to them.
If you're looking at the back of the clocks, then it's the bottom right one, with a track going to the foot of a diode. If you're fondling round the back, then it's the bottom left one. There will be one a bit more to the left, and a bit above it, but that's the left light for the dialset.