Vintage KOSS PRO4AA Headband Headphones Adjustable Pro 4AA Original –
Could use a deeper cleaning on the inside ear-cup. The knob on the left ear is missing.
Vintage KOSS PRO4AA Headband Headphones Adjustable Pro 4AA Original
Very clean pair of KOSS Pro-4AA headphones. Tested and working, but the bass level seems a bit muffled in higher bass listening.
Vintage Koss PRO4AAA Professional Headphones Wired 1970 Working Great Condition
Headphones are preowned. tested and in working order.