Interesting. I am somewhat suspicious (suppose its the old professor in me).
Stars & Stripes '83? Designer of Intrepid--Owen Stephens? Two typo's from an America's Cup enthusiast who owned multiple 12 meters...hmmm.
However, in Ian Dear's Enterprise to Endeavor The J-Class Yachts there is a picture of Quadrifoglio on p. 156, ex-Shamrock V from 1974, and another photo the following page from 1980. The 1974 photo shows a set of bulwarks installed--this could be from the subsequent restoration completed in '80.
-Charles