In the past few years, we have covered a whole host of rolling ball clocks here. The Arrow Electric Domino Clock is also worth a look. Introduced in 1983, this clock shows the time with 3 tiny balls that turn the dominoes. It ships in a snap-fit kit with motor, labels, cover, and everything you need to put it together.
More gadgets like this: here
Arrow Electric Domino Clock from 1983 - Gadgetify
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