I too find myself drawn into the vintage Citizen world having bought a stainless 70's dress watch 21 jewel for less than 20 cents, gave it to my WM to service and lens change, looks like new now.
My WM at the time told me these were a very precisely made movement more so than the ETA Swiss stuff, on getting it back I put it to my ear to listen to its beating mechanical heart and was surprised to hear absolutely nothing, so damn quiet, completely stumped me.
I now have another similar one based on the first and like the former the latter make almost zero noise when ticking, no other of my many of watches do that.
I made the mistake of missing out on a 32 jewel ( I think that was the number) and have been kicking my self since as that particular one had extremely collectable (and growing) value. The oscillating weight arrangement was quite different than standard.
Here is an interesting link to the current crop of Citizen Fugu divers that I have been lusting after, preferably in Titanium.
https://www.watches88.com/cat_citizen.cfm