sablatnig

Marinenummer '580' is a Sablatnig SF 2 twin-float seaplane, not a Friedrichshafen

Your scan is in mirror. When reversed the marine number '1099' becomes visible which identifies this machine as a reconnaissance floatplane Friedrichshafen FF 33j. The text in the German gothic style of printing gives Abb. 112. Aussetzen eines Aufklärungsflugzeuges aus Flugzeugmutterschiffes Santa Elena Pic. 112. Launching in the water of a reconnaissance airplane from the aircraft carrier Santa Elena As the Santa Elena was always stationed in the Baltic, this must be the place. The picture is a scan from an old German book ?

Kees Kort I think that this photo was copied from a German book, but where and when and which book is a mystery!

After the war most nations made 'standard' official histories, also separately oriented on the war in the air. Germany as a losing nation made a far lesser effort, but they published in 1920 already a massive tome of 600 pages. Original copies of this book are much sought after by collectors, although they fetch mostly high prices when available second hand. This is a description of the book Neumann, Georg Paul. 1920. Die deutschen Luftstreitkräften im Weltkrieg. Your scan of pic. 112 is a scan of this book. There is also an abridged English language version of this work (about 300 pages) which evidently gives far less.