Although I've never seen them used in a clock, I use the Russian IN-3 neon bulb in many of my projects. This bulb has a filament unlike others and allows the same bright illumination on DC or AC! The bulbs are a bit on the large side and they really need to be "aged" well for good results. I've seen many that flicker and sputter but they are cheap so get a bunch to play around with.
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