DH-77-S design 200 OHM headphones square model 1977 Japan

This is a very cool flat design pair of headphones made in Japan by Hosiden. These are rated 200 OHM and were sold in the Netherlands by a high grade music shop called Roelofs. The designation for the design is DH-77-S and these were also sold on other brands like Atlas / Kapsch & Söhne KS but these were mostly only 8 ohm headphones.  The earpieces are marked left and right and measure 7 x 7 cm or 3 x 3 inches. One size fits all, adjustable in length. Very clean and working the inside ear pads show signs of use, the plug has been changed for a small one fitting even your ipad today. Check the attached video for lots of vintage Headphone info!