This boat had a crest mounted on the front of the tower which was the coat of arms of NEUNKIRCHEN,SAAR. This was in the shape of a shield with what looks like a church with a tall, sharp steeple in the center , 2 crossed hammers in the upper left corner and in the upper right corner a cogged wheel with an \"S\"shaped symbol in it. Please see page 61 of U-BOAT EMBLEMS OF WORLD WAR II 1939-1945 by GEORG HÖGEL.