Koss PRO-4 AA vintage headpones

[Rare Bird]

Hi Alex,

They look very nice, but they're not 1970s originals - compare with these and you'll see:

They look possibly like the newer models that were introduced in the late 80s (defo 80s vintage, I think), see info below (from the current Koss advert):

Marco:
Those in Alex link are PRO/4AAA, they came out around 1977, they are what i had