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Riad makes some of the coolest clocks, ever - the single-digit Nixie clock is awesome and there are a couple others too. Code and schematics included - "A while ago I found a Burroughs B-5853 Nixie tube kicking around in the lab and decided that I should put it to good use. Since I only had one of this size, I wanted to make a single-digit display out of it. After I saw Jason Harper's Nixie clock gallery, I decided that one digit really could make a cool clock." - Link.
More:
Weston voltmeter clock - Link.
Oscilloscope CRT Clock - Link.
