These are in good working condition.   The original phono plug has been replaced at some point and the replacement plug has some cracks.   It's working normally.  Both speakers work well.  No pops or crackles or any issues.   All padding is secure.

There is no decals or packaging but this visually matches the 1959 model, date is estimated.

No similar pairs have been listed or sold on eBay for at least 3 years.   These don't come along often.

Introducing the Vintage Koss SP/3 Stereophones Headphones, a piece of history from the 1950s. These headphones were the world's first working stereophones and are now available for purchase. The brand, Koss, is well-known for producing high-quality audio equipment and this model is no exception.

The headphones are in good working condition and have been well-maintained over the years. They come with all the original parts and accessories, making them a valuable addition to any vintage electronics collection. Don't miss out on this rare opportunity to own a piece of audio histor