Could it be the Rubens Barichello, ref. 26078RO.OO.D001VS.01 ?
credit: wind vintage ...
The RB II looks awesome.
It was one of my favourite ROOs, along with JBB, Sincere. Didn't own one, as it was quite pricey then. It is becoming more affordable now.
How amazing it would be to look through Octavio's private sketchpads...
I wonder what was designed and never produced?