Mysterious single-digit LED clock kit from 1979

Описание к видео Mysterious single-digit LED clock kit from 1979

This clock uses an MM5318N (among several other ICs), which is an interesting choice, as this IC was originally intended for use in TVs to display the time on the screen. Presumably the MM5318N was picked because it has inputs to select which digit is displayed.
For those who want a closer look at the circuit board as it was when I got it, here you go: https://imgur.com/a/xU0H0qI

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