The base decor without the threading is in a color combination which by itself would lead me to Welz as the house, that is why I mentioned both. An identical shaped and sized piece would be what one would need for a solid attribution, and we need to be careful there.....
It is coming to light that many pieces of glass previously attributed in the market place and some museums to Kralik are actually pieces by Welz, and research on that subject is quite young and ongoing.....
If I had to make a hard choice on who did it, and I do not think we have strong enough evidence yet to do so, I would say it was Welz production..... The colors and decor lean that direction....
but I state again.... there is not enough evidence to nail it down at this point...... Most likely one of those two houses..... but which one remains to be seen....
Craig