This looks like a great keyboard for text graphics. There are dedicated keys for switching character sets, choosing and defining colours, manipulating fonts (DCRS), etc. Towards the top right, it looks like a dedicated set of keys for “pixeling” on a sub-char level?
This is the TBT-03 keyboard by Loewe, for the MCT 26 television. Circa 1984. It is used for the German videotex format BTX (and possibly other similar CEPT-standards like the Mupid?). Found here. Also see the TBT-02 keyboard