I have pictured these PHILIPS HDS 201 in Magdeburg : http://phozagora.free.fr/lumpic/lumweuro/DE_Magdeburg34.jpg
I have also seen some PHILIPS HGS 201 between Berlin and the Polish border.
In Poland, you find some PHILIPS HGS, especially in Poznan :
These PHILIPS HDS and HGS appeared in 1974 and have been discontinued around 1985.
I think that among all these PHILIPS Marbella (SGS 203, SGS 204 range...) you find in DDR and Poland, some of them have been installed before 1989.