I bought a SONY MDR-7506 it costs ￥688

the date of production is 2019.2

on the top left corner, that blue dot represents Sony MDR-7506

https://twitter.com/seanolive/status/1053856172539867136?lang=en

By Z Reviews

https://www.youtube.com/watch?v=TLHbkCDgllU

By metal571

https://www.youtube.com/watch?v=Ob7afLIGjng