I have bought a beautiful looking Quadraflex headphone. Here is a photo of what they look like (not the ones I have bought) from the site Vintage Headphones.
That site has pictures, but no info. I have googled Quadraflex and found info that it was a 'house brand of Pacific stereo' a US chain store. But the seller believes they are Japanese from the 1970s and going by descriptions of the US Quadraflex headphones, these are not the same.
Has anyone got any ideas, links to info or knowledge? Whatever they turn out to be, I think they look stunning and are like the Pioneer SE-L40.