The preliminary Free City of Danzig registration FD-15 is blocked, but construction number 1504 is clearly readable on the front fuselage of this airliner of the Danziger Luftreederei. The front fuselage is painted yellow and black. It does not yet carry the silver crosses of Danzig (Gdansk) on the rudder. To Dz-4 in 1921. While the Fokker-Grulich F.II version was built by Deutsche Luft-Reederei, 1504 is a Fokker c/n. Presumably due to a miscommunication it was issued to an F.III too, H-NABH. Photo from: ETH-Bibliothek Zürich