The "Dodo-Postcards" watermark is NOT on the actual card – it is an online watermark only.
Ifsda Kongress. Dusseldorf. 1983. International Federation of Stamp Dealers Associations. 1984. Deutsche Bundespost
Ifsda Kongress. Dusseldorf. 1983. International Federation of Stamp Dealers Associations. 1982. Deutsche Bundespost
Ifsda Kongress. Dusseldorf. 1983. International Federation of Stamp Dealers Associations. 1982. Deutsche Bundespost. 1984
Rund um Berlin. Kongress der Fisa Federation Internationale des Societes Aero Philateliques
Rund um Berlin. 75 Jahre Postbeforderung in der Luft. 27. Kongress der Fisa. Federation Internationale des Societes Aero Philateliques und Luposta
Dusseldorf. Internationale Kunst u. Grosse Gartenbau. Ausstellung. F. C. B. D. 1906
Dusseldorf 90. International Youth Philatelic Exhibition. USSR. 1990
