The postcard of Des Marronieres signed with the Otto's hand

Robert Oelbermann (24.4.1896-29.3.1941). Founder of Nerother Bund, perhaps he was the prisoner of Dachau with whom Otto was accused of fraternizing during his time there (circa 1937). Died in Dachau. On the photo at right
Karl Oelbermann (24.4.1896-9.10.1974), otherwise known as 'King Oelb'. Twin brother of Robert Oelbermann. Initiator(?) for Otto Rahn Monument building in Hunsrück (1964), leader of Nerother Bund.
On the photo at left