I'm not worried about it Ivo
I'd just like to identify my vase.
And that book says it is WMF.
And it also has a bowl in there that does look like it is a Myra-Technik Unikat piece, that isn't in the Burschel book. Which of course means the Burschel book may not be 'complete' and it's likely that there may be more Unikat pieces that are not in the Burschel book. I can't imagine they have managed to cover every single piece (not that I ever imagine that any book would be 'complete' of course).
So the Burschel book may feature pieces that are all correctly id'd, but possibly doesn't feature all the pieces.
I do appreciate however, that none of the three shapes found so far with this decor, are found in the book.
And I probably wouldn't be worrying away at this one, if I honestly felt there was no way it could be a WMF piece, but I can't discount that completely