Blaupunkt Madrid Deluxe 20810 Radio

Can anyone give me some information about the above radio? I've had it for quite a few years. It was my grandfathers. I'm curious to know when it was made, where, and the current value. I'm typically really good at this kind of research, but I cannot find anything on this particular model. It is very similar in appearance to the Sultan, but the back and front clearly say Madrid.

Any help/information would be greatly appreciated!

T