You got it!
This is the original PMG talking clock, at the Telstra Museum on 12 Kitchener Parade, Bankstown.
It still runs perfectly, and they are happy to demonstrate it.
The museum is a fascinating place. Saw my first wire recorder today. It works too, and they demonstrate it with a wire reel from hmm, I forget. Around 1950? The sound quality is excellent, which was a surprise to me. I'd like to see tape last that long.