Sony Building (Tokyo) Radio 9R-41

I have a Sony Building Radio ( 9r-41)
There no information to find about this transistor radio from Sony!
I there someone who has information about this radio? Is the radio rare or
Anything you know about it.
I have also a philips Evoluon (flying saurcer) radio, this is also a radio made
Like a building (Philips Eindhoven). The Sony radio might build before or after the philips radio?

Thanks for reading!

Jan Bonne