Beag FDS-26 600oM Stereo Headphones, made in Hungary

Link: radiomuseum | manual PDF

Notes 2× 600 Ohm, 200 mW, 126 dB.
Net weight (2.2 lb = 1 kg) 0.350 kg / 0 lb 12.3 oz (0.771 lb)

Manual: Beag FDS-26 600oM Stereo Headphones