They built a lot of variations on this one - I think some had mirrored scales, but probably the same meter movement.
Right about the needle movement - that's what I've been alluding to in this thread. Even regular, low frequency (think 1Hz or less) periodic functions, whether sine, square, triangle, sawtooth. With an analog meter you see immediately what's happening. Digital: Just a lot of wild numbers bouncing around. Of course, lots of DVMs have the little bargraph down below to help, but it's not the same.
A few years back I banged together a little CO2 controller for grow rooms - modern CO2 sensor with an analog output fed into an AVR to run the CO2 generator, room ventilation, etc. On the first pass I put a digital display on it for the ppm reading, but then built a second rev with a nice big analog meter instead, kinda just for fun. I tell you, even I was surprised at not only how much faster and easier to read it was, but also at its retro/sexy/cool vibe.