Wow, Boodo Khan. They existed like 20 years ago. I used to have 1 during my secondary sch. The walkman came with the DOL (Dynamic Optimum Loudness) if I'm not wrong and its a very basic walkman (w/o remote, auto-reverse, radio etc). The set even came with headphone for e start . The sound was unmatched (ok, then I was a basshead )
Those were the days.
Good luck in hunting