Here the problem solved.
I asked to Renato Levi's son Martin that he answered to me sending this copy.
A page from "Milestones in my Design" of Renato Levi.
Levi wrote that Barbarina was builded for the Count Augusta (owner of the Augusta industries that builded helicopters and World Champion motorcycles).
Augusta wanted a boat similar to that of Gianni Agnelli G.50 (G.50 was builded after that Agnelli was retired from the offshore competitions with the intention of the "Avvocato" to see the offshore races with a boat more fast of the competitions boats itself) ,but faster of that.
Barbarina builded by Cantieri Delta of Anzio(the same of Genth's Thunderbird),was launched in 1969,powered with four BPM Super Vulcano and with a max speed farther 60 knots. Was the same design of Agnelli's G.50 but instead a passengers cockpit forward the driver's cockpit(see the pictures in post #5),Barbarina had a toilette under the deck.
Many Thanks to Martin Levi
http://www.leviboats.com/