My Koss Pro 4AA headphones look the same as those worn by the guy in title banner.Originally Posted by Macca
Pro4AAA came out in 1976. They look like the ones you bought off of eBay to me.
Koss own site has a full timeline of all their headphones and pictures of them too:
https://www.koss.com/history/
Should resolve all questions
As far as I know, they are the original 1970's version, but since I bought them used from a member here, without box or any paperwork, cannot be absolutely certain.
What kind of jack plug does yours have?
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