I am sure, dead sure, in fact. All the heavy cruisers, from Trento to Gorizia did have them. It was outmoded by 1939, but the Italians by then had the 90mm gun instead. Also BB:s had them.
WHAT?!
This is "Trento"
http://digilander.libero.it/en_mezzi_mi ... s-1929.png
Show me ANY ([s]"K" letter in the title "For the leading magic" (c)[s]) 66-mm cannon on this cruiser! I see only 203-mm, 100-mm and 40-mm.
According to my sources, 66-mm AA-canon NEVER EXIST in italian navy.