We do get the odd bit of work in buildings unchanged since the 60's and also former single occupancy industrial sites which again seem to have got stuck in time and I do try to get them issued to me as they are so interesting (& often so so bad!) so I get all sorts of interesting photos.
I'll admit since working out how to post images I'm on a frenzy, plus the last few buildings I've done are old ones.
One was a single stair office (? former large house) that again in the early 70's had thrown in an alarm - basement to second floor, but with MCP's to ground and first and only one bell at the entrance, all in normal cabling and no panel, just the mains supply switch which I couldn't find as it wasn't red or marked and I fear might not even exist (or be switched on!). No weekly tests, no servicing.
I think there are some bulbs that could be wired in to it as it reminds me far more of EL units than any other use. It's had it's day either way!