Help confirming Rosenthal vase is Vasarely  

Gee, I don't know --
Looks more like Frank Lloyd Wright to me. Or maybe Alexander Girard ?

In
my experience, any Rosenthal collaborative pieces are very clearly marked as such.

Photo of base
Other than the embossed size and shape number on the base there is a # 10 stamped in white FWIW

Clearer and more pictures please.
I would love to see the top of this vase. In doing so, I could tell if the form of the vase was designed by Elsa Fischer-Treyden. A number of Vasarely patterns were placed on her one style. it looks like Vasarely to me but I need to see better pics. I have collected a lot of Rosenthal Studio Linie pieces by Tapio Wirkkala over the years, and I can tell you that they were not always marked with the name of the designer. Generally, Rosenthal would impress the model number/ size (not always) of the vase above the green Rosenthal hallmark for identification purposes. You mention that you see a number 10. Where is that located?

I went back on and could barely see
That the 10 might be above the hallmark. Please advise. Are there other numbers and a / before the 10? If so, the 10 is the height and the other numbers is the model number. Please post exactly how the numbers and any characters are lined up.

Thanks for the help
The embossed numbers above the hallmark are 3512/20
The #10 is in the underside photo if you scroll right

possible help
Amazake,
Should a production company still exist (Rosenthal), I always go to the source first.
I received help with identification from Rosenthal Germany. They were more than helpful, providing full designer identification, production dates and pricing at the time in Deutsche Marks (I only requested designed information). They were the "best of the best".
The contact I have is: Klaus.Benedix@rosenthal.de
I hope this is of some help and that you post your results.

Niceguy
I attempted to email your contact but the email did not make it to Klaus. I did email Rosenthal USA, I will post their response.
Thanks for the simple suggestion, to email Rosenthal directly.

old contact
Amazake,
My contact was old. I did begin my search through Rosenthal USA and they forwarded it to Germany. Rosenthal Germany was extremely prompt and a tremendous help.
I look forward to hearing your answer. I like your vase.

Thank you for the additional photos.
The #20 is the height of the vase in cm. The number before the backslash is the model number. I am stumped with respect to the number 10. I checked my collection, and none of my over 50 Rosenthal/Wirkkala vases has such a number. The vase is a Fischer-Treyden form if that helps. I am still leaning towards Vasarely. Watch me eat crow.
As suggested, check with Rosenthal Germany. Rosenthal USA is not much help.