foufymaus,
That is a nice machine. I like it. When you get more pics, please show where the cams go and what they look like if you can.
I still have a set I'm trying to ID.
The little cardboard disk over the wires in the plug is normal. Nothing wrong with it. Those are still used in many styles of plugs, especially the retro vintage ones, and have been used for generations. I make my own as most of the machines I get don't have anything covering the wires in the plugs at all.
Joe