do you mean this ?markenschaetze said:Here you can find a wonderful illustration of Dornier Do 20:
http://www.markenschaetze.de/reklamedatenbank/suchmaschine.html?action=in_galerie_suchen&gs_suchbegriff=Do 20
According to "Modern Seaplanes of the capitalistic countries", I.Baranov, K.Ekimova, Moscow, 1939