Listing is for a rare and unusual set of 1920s-era headphones. This is actually the first time I have ever seen the “Yanky” brand on anything. Unfortunately, information on the brand appears to be non-existent, as I was not able to find even a passing reference to them. They do seem to be well wired, though they are untested. This is a phenomenal opportunity for anyone who collects, or is otherwise interested in antique headphones – and/or the evolution of speaker technology. If you happen to have any information on these, please reach out. Moreover, please feel free to reach out with any questions you may have, as well.