The following info and drawings are from "I Sommergibili Italiani 1895-1971" 3rd Edition 1971. This book on Italian Submarines is part of the Officio Storico Della Marina Militare Series that separate volumes (19) cover Battleships to smaller warships, and etc. Please note the as built bridge design and modified bridge design. The last pic shows the Saint Bon underway with the modified bridge design. In the bottom picture using "Italian Naval Camouflage of WW2" by Marco Ghiglino the Saint Bon would seems to be wearing the Maricosom La Spezia camouflage using a blue-gray base with dicing in neutral shades (brown) The upper deck being painted a lighter blue/grey. The bulges do not seem to have been painted in the dark grey as specified in this scheme. In June 1943 the Cagni sailed from Bordeaux with an intermediate grey color with two black (or very dark) triangular patches on the conning tower and hull. Hope this helps.