Vintage Rare Original Green KOSS Pro-4 Headphones HiFI 1960s Stereo Inputs

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Vintage Rare Original Green KOSS Pro-4 Headphones HiFI 1960s Stereo Inputs:
$26.00

These headphones work on both channels. They have stereo inputs and include a splitter (or whatever you call it) to plug into a single jack. Check out the pics and ask questions. My son is a sound engineer and says they sound fine but I don\'t know much about this vintage item. Thanks for looking!