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These are some probably war-time headphones, Omega "Typ 5T" brand, with Koss PortaPro speakers modded into them. I do have great respect for old stuff, so all the old parts were unharmed and put into bags respectively for left and right headphone. The only thing that were damaged were the portapros. The box only contained the headphones, and "Typ 5T" is the only text on the box other than "OMEGA".
I like those old headphones.
However, I'm considering modding the cord too, in which case I would have to take it apart again. If I do I'll document it better.
Unscrewed the headphone covers.
Carefully removed guts.
Trimmed the portapro headphones to fit inside.
Cut the portapro wire close to the headphone.
Stuck the wire through the hole in the headphone.
Tied a small knot to secure the cable.
Exposed the audio cables and burned off the insulation.
Applied heatshrink tubing.
Twisted the ends very well together.
Shrunk heatshrink tubing.
Closed up cover.
Tested, success!