Just got this vintage can by mail from Germany. Sounds good plugged straight in, but I'm going to take it apart and clean it. Pads are quite flat and the elastics dead as can be. I understand the pads are obsolete so maybe a little surgery with new foam is needed.
They look fine for their age (they're from the 1970s, I believe?), except for the "R" plastic disc. Should any of you have a spare one I'll be happy to offer a small reward if you care to post it to me. Send a PM.
If there's interest I'll take some pics when I refurbish the headphones.