I don't know if you have this book already, but it should give you some more in depth info.
1914 - 1918. Minenkrieg mit U- Booten. (Hardcover) by Harald Bendert
Unfortunatley for you, it is in German, but there might be some photos. However, I do not know if there is a photo for your sub. I don't own it (yet).
If you need some technical info: Eberhard Rössler, The U-Boat pg. 44 - 46
And some other book recommendations:
- Die Unterseeboote der kaiserlichen Marine, Eberhard Rössler - SM UC 71: Das vergessene U-Boot vor Helgoland, Claude Fröhle & Hans J Kühn
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