This Junkers J 4 (I.I) is on display in Deutsches Technikmuseum (Berlin), it
used to be in the Italian Caproni museum.
Only fuselage and engine exists, but seems to be in very good shape.
Note the thickness of the armour plating and the quick-latches used to hold
it in place around the engine.
Engine is a Benz IV
Photos by Knut Erik Hagen