Pic 1 Vase 1 - That shape, at least I think it is that shape and possibly the same decor was shown in the Tango exhibit. at 41 seconds into the video in the link below it is in the far back right of the shot. I believe it is in a different case with a separate tag than the Welz items. I have not successfully linked the decor to Welz at this point. Although the entire base can not be seen, the shoulder of this shape is quite distinctive and I have only seen it in this one form, and in several different decors, but none confirmed as Welz."[ Mod: text above converted to a Quote Box for clarity. ]
I think I have found the vase he is referring to in the video of the Tango exhibition at Regionální muzeum v Teplicích (27 January – 4 March 2012)
It is among some pix taken by Dirk at the Novy Bor exhibition of TangoSklo Proměny barevných kontrastů.
They were taken some months earlier than the video in August 2011.
You can see the vase here:https://picasaweb.google.com/108140812446658939096/CzechTrip?authkey=Gv1sRgCNz6s9vqyMSeRQ#5643730253067267730
There are actually two vases .... slightly different.
There's a red one "A" and blue "B" (see below).
Yours is the one on the left. "A"
They seem to be in a group which at that stage was part of the Rückl cabinets.
There is another photo of it here again by Dirk:https://picasaweb.google.com/108140812446658939096/CzechTrip?authkey=Gv1sRgCNz6s9vqyMSeRQ#5643939852839344082
Some of the attributions seemed to have changed.
By the time it got to Teplice it "A" was no longer with the Rückl pieces.
The similar blue vase "B" was still with the Rückl pieces.
As Craig mentions your vase was in a cabinet to the right of the Welz and Tomschick pieces.
Tantalyzing cabinet is that one!