I know your problem, I bought a set with a Walkman about 20 years ago and they are the most comfortable I have ever worn, plus definitely the highest sound quality I have ever heard! I have been looking for another set for years in UK but no luck! Does anyone know a way to contact Sony in Japan?

You never get MDR-W10 B-cuz it is rare item. But i have kkkkkkkkkkkkkkkkkkkkkkkkk

Probably you couldnt. they were released for 10th sony walkman anniversary long time ago (hey, i have got them and they still works :-) )