In doing research for the turm emblems I've come a cross a couple of things which I've not known before. e.g. the Laughing Sawfish emblem carried by 9th FLotilla boats appears to have actually been blue and not black, green or red.
Excerpt from Georg Hogel's "U-Boat Emblems of World War II:
Quote:
U-659... According to Canadian notes: "Blue swordfish" sunk 04/05/1943
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And according to the book U-88 had the tower painted light blue!