Interesting photos Klaus, thanks for sharing. Some of the so called "Elipidifor class" ships ended up in Greek hands after 1920 and some sunk during ww2.
Here is a photo of KONSTANZ, the name that the ship took in 1941 when she was used as a German hospital ship.

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That was the second time she came under German control, the first being between May-Oct 1918 when she became a German booty in Sevastopol.
She was seized on May 19, 1943 by British forces while 10 miles NNW of Pantelleria on the grounds that she violated the rules concerning hospitalships. The Germans reacted to this but she remained under allied control. Actually after ww2 there was a legal effort to return the ship to her prewar owners, as the British wanted to keep her as war booty.