Hey, collectors! There's a seller in China who claims to have a warehouse full of Koss K6 Stereophones, new in box from 1972.
These were the first headphones I ever listened to - Dad had a pair on his Fischer stereo - but that pair fell apart and is no more. I may order a set for nostalgia.
I know nothing of the site or seller; they may be a rip-off, they may be fakes. (But why fake old phones when you could get more buyers for new ones?)
If anyone out there was interested, it'll be someone here. :)
The price ($26.32) isn't bad, but the shipping ($74.88 each!) is stupid.