SANYO Dynamic Stereo Headphones E-700A - Brand: SANYO - Model: E-700A - Impedance: 8Ω Thank you for viewing. This came from my father's parents' house. I'm not sure how many decades old it is, but it's in good condition for its age, and I think it's probably unused. If anyone is interested, please let me know. Since it's quite old, I cannot guarantee the condition of the box or the contents due to aging. However, the appearance seems to be in good condition. I cannot accept claims such as "it doesn't work." Thank you for your understanding.