Is this an original factory made TPS-L2 or is it custom made? I've never seen one with the Walkman branding while also having the lettering at the top of the player. :
イヤホンの歴史 2 イヤホンの誕生 ~ポータブルオーディオという新世界~ : J-CASTニュース
The Sony Walkman
Random Access Memories: Sony TPS-L2 Walkman (1979) | Stuff
Retromobe - retro mobile phones and other gadgets: Sony Walkman TPS-L2 (1979)
Sony Walkman MDR-3L2 Original TPS-L2 On-Ear Headphones – Retrospekt