The excellent Dino compendium shows there were 247 Dinos produced in Bianco Polo Park white. One of my cars (03342) was originally supplied new in this colour but repainted to red in 1981. The "rare" white is called Bianco Luna Metallizzato and only one car was supplied in this colour.
Current: F50, 246 GT (x 2), 246 GTS
Past: 360M, F430 spider, 430 Scuderia, California (x 2), 458 Italia (x 2), 458 spider, 246 GT