Hans, that looks to be a pretty neat item that you have there. Haven't a clue, to be honest. A Columbia Europe (Holland) promotional/publicity item, perhaps, for some 'exec' to hang on their wall? (I wasn't even aware that this one had been issued in Europe, all of the pressings I have seen have been US with the red Columbia label typical of the early 1970s).
That metal 'master' must sound pretty far out. I gave my vinyl a spin a bit earlier and its total ring modulator madness, especially on 'Hey Jude'. I wonder if the Beatles ever heard that one?
If the metal of the 'master' didn't destroy your needle the distortion on the ring modulator sure will..
Great find !