This is the Gamma IV, same as what Keyo has above. This has some nice features, 4x20w, CD changer control, greem dimmable lights, code protection and red anti-theft LED, telephone mute, speed dependent volume control (GALA) when connected to the the blue/white speed sensor signal and can be retrofitted with aux in, bluetooth or iPod adapter using the CD changer inputs - there's even a guy in Germany who retrofits a hardwired aux in cable with 3.5mm jack and Bluetooth 5.0 module for a pretty penny, which means you can retain the CD changer.
The cassette flap makes it a lot less attractive to thieves than a fancier unit - and you can even play you Awesome Mix Vol. 1!
There is an identical looking radio with blue/red illumination rather than the original green, so be careful to check this when buying.