Possibly Nord Noratlas from the aircraft profile ?
Dear Mr Brian, good evening!
Yes, it is! Thank you very much for your suggestion.
I checked on the web, and the airplane is Nord Noratlas.
In the following youtube video, https://www.youtube.com/watch?v=1R4BMfob8eQ , it is possible to look at that square panel on top right, between minute 3:13 to 3:23 (ten seconds). Exactly between 3:22 to 3:23 it is in the top right corner.
I will check for schematics (pinout), even if I suppose it is so difficult to find anything about.
The panel in my hand is like-new condition. It seems to be like if it never have flown. I have attached 3 pics to show it.
I tried to feed bulb lamps by DC voltage and, surprise, they works!!! I fed it by 14 Volt DC, since I don’t know voltage of that age planes. (probably 24 DC ???) and it is magic when bulbs emitted lights!
I will put a youtube video next week to sho it.
For the moment, again, I thank you very much indeed!
Sincerely, best regards and best wishes.
Roberto.