Hello,
i am the son of Erich Kurztusch. My father has a big convolut of things and documents about U-170. But he is missing his soldbook and so i was very surprised to find it here. He told me it was about two years ago when he got a visit by a man who was very interested in the history of U-170. He forgot his name. The man told my father to give him his soldbook so he can copy it and than give it back. But my father didnt get it back.