Hi Ardy,
thanks a lot for your reply!

The link to the finished catawiki listing works perfectly fine for me, maybe you didn't scroll down to the details at the bottom of the page? There are some very good big pics of the vase...
Have you ever seen this acid stamp before?
Looking through the Seguso vdA book, most of the massive pieces there seem to have a much more delicate rim. And the shape is not in the book either; Archimede Seguso would surely be another possibility, but then I wonder about the uncommon Seguso mark.
I will post two of my A. Seguso pieces in a similar colourway in a new thread... (For comparison and for show

)
Michael