Hello, Nice vase....
I would be very interested in seeing an image of the mouth of the vase if possible, showing the internal ribbing you are referring to.......... and also a very large closeup of the bottom half of the vase from the side showing the decor well. That could be emailed directly to me if you want using the email icon on the side.
I will reserve any opinion until I have additional images. Welz is not all that well documented at this point, at least publicly. The website I have been working on will likely contain the largest amount of Welz documentation in any format. I do not have a record of this shape, but that does not mean much at this point. I also do not have a recollection of this shape in a Kralik decor.
Welz does have a decor which has been dubbed "Translucent Lines" which is a similar line like this piece shows. This is a different decor than the "Vertical Lines" you are referring to, which is much better known and recognized at this point.
Would it be OK with you if I copied and used your images on a website project I have been working on for the last 18 months or so?
I look forward to additional images..... This is a very pretty vase, regardless of who made it..... :mrgreen:
Craig.