@jgeorge So cool!

https://www.reddit.com/r/whatisthisthing/comments/1e960ti/ibm_audible_random_timer_vintage_electronic/ has some good ideas.

Have you tried running it? The length of the random intervals might give you an idea of its intended use.

I love the way they put some perfboard into the PCB design and used it with the bodge wires! Maybe it's a prototype, if they were so confident they'd need to bodge it? :)

Anyway, such a neat find, and some very cool archaeology by you.