Thanks a lot, Ardy and David! -- So AS as I thought (I think left from the word "Murano" on the label is still a little bit of the scalloped edge visible).
With these "better" Murano pieces I am always very impressed with the quality.
And hard to judge from my pics, but it is really a huge
vase, almost the size of a waste paper basket.
@Ardy: I found it at a local second-hand market site; the seller from western Austria was really nice, and I even saved shipping costs as her daughter who lives in Vienna went home for Christmas and brought it with her, so I could pick it up.
@David: I told you I would show a nice piece of Murano glass after Christmas
When I spot a thing like this I just cannot stick to collecting exclusively Skrdlovice...