My first guesses off the bat would be Paiste. I personally don't know of any other cymbal makers in Germany, at least not during the time when there was an East / West Germany. I know Meinl was around, but not sure they were making gongs then. But from the quick research I just did, I'm going 99.9% that this is a Paiste. Found numerous photos of the same gong and here is a video clip. Also missing the Paiste mark, but identical to yours and the others I found, aside the missing Black " Paiste " On the top or bottom ( seems they did both, depending on the size )

[ame="https://www.youtube.com/watch?v=81fNWDMZrPY"]Vintage Paiste 30" Gong - YouTube[/ame]

Thanks ARCHxANGEL,

I appreciate you sharing your research with me. Good looking out!

-nYcTracks