Thought I would resurrect this thread, rather than starting a new one on the same topic. I have an amber version, 21cm (checked three times and definitely not 20cm). Mine is a pattern match for BFG's same size green vase, and Simba's smaller pink one.
I have compared it to the Rosice 2911, and the proportions do not look quite right. Not sure if this is due to the image being a drawing, but the narrowing at the base, and the shorter first section at the top on mine, raise questions.
Most of the images I have found, that match, are attributed to Davidson. However, I haven't managed to locate any catalogue images for firm attribution. I am almost certain its not Inwald.
There is some fogging/water marking on the inside, around the transition between the first and second "rows", which made me wonder if these pieces ever had frogs?
The vase is darker in the "flesh" than in the photographs.