My '68 has it's original Blaupunkt AM/FM/SW radio. In the late 60's Blaupunkt was busy marketing itself to the US as a high end stereo company. It developed a reputation, thanks to advertising, as a desirable brand over American products like Pioneer, Craig, etc. in audio and department stores. So, when German cars were marketed with Blaupunkt to the uninformed consumer, it was actually considered "cooler" than a relatively unknown name like Becker.
They achieved this the same way Corona marketed itself as a good beer... there's no accounting for taste.
Ray
'68 280SL 4-spd Coupe