I've had this vase a little while, and I'm still stumped. I'm not even sure I like it, but it does intrigue me!
I think I can rule out WMF Ikora (I have the book, and several bits) and the type of glass currently attributed to Hantich. It doesn't resemble any Ysart shape I've seen. Do any of you knowledgable people have any clues?
A reverse image search on Google brought up just one other piece of exactly the same type of glass and decorative treatment, in a different vase shape. The link was to The Saleroom online auction platform, but it no longer works, so no luck there.
Dimensions: 18 cm high x 13.5 cm top rim diameter x 8 cm foot diameter.