Gentlemen, you are looking at the TOP of the range, desirable car Radio/CC player made by Blaupunkt in early 90's!
Blaupunkt Koln RCM 40 (same as Symphony RDS) was (and is) expensive due to innovations and therefore it was mostly used in premium cars such as:
Porsche cars (Porsche 911 Turbo, 964, 928, 924, 944), Mercedes, BMW, Ferrari, Aston Martin cars and other greats!
This has RDS function, 4 channel output, Dolby, electronic, amazingly many functions, top radio/CC player at those times!
Button illumination colour is Amber, screen illumination can be set to Green or Amber color.
Tested and all works fine, but to eject my cassette it needed some finger (a little lift) help from my side!