In reviewing my other post on the piece, I remembered that it was not a piece in the same shape, it was a piece in similar colors to mine David had directed me towards, so these are the only two I have ever seen in this form.
The rim of mine is the same as the one on Henry's. Mine is also just under 20 cm tall and quite heavy. It has a polished base and exhibits age wear underfoot. The difference in the appearance of the shoulder angle is due to the difference in angles of the images. I think the shapes are the same.
As far as the Cranberry layer on Henry's piece, if one looks very closely at the image of the neck from the side you will see a small tinge of pink in the clear casing surrounding the neck. This indicates an extremely thin layer of Cranberry that traverses the body of the piece and is then visible in the neck region. That particular feature is also present in a huge Sommerso piece I have that has been attributed to Poli. (19 x 10 x 4 inches and 25 lbs) Pic attached. My piece does not have the same thickness of Cranberry at the base, but there is more of it near the bottom as the blue is color shifted to a purple by it's presence, and as with Henry's, it is very thin at the neck and only visible if one sees it at the right angle....
So, although the use of pink and cobalt is present in many knock off pieces, my feeling would be that the degree of execution on Henry's vase would preclude it from being one of "those" pieces, as they are generally much more clumsy than this.
I have absolutely no doubt that these two pieces are from the same house. I do not know if they are Seguso/Poli pieces though.... Time will tell....