thanx, I get the picture. I haven't had the time to take my few DSM's into pieces and make one fully working but I guess it works similar to the Gruen Teletime TNE LCD as pictured below:
Note that oval Optel DSM's use completely different modules then the more common square ones like Optcom, Segtronic.
Nepro's are identical to Microma however I'm not sure who made what as Microma used Swiss movements also. I have a few to work on with the displays detached so they will need some silver epoxy to attach them again.