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1910 GLÜCK AB! - GUT LAND! / 2 unused pictorial post cards intended for balloons or Zeppelins, 1x in creme color with additional-printing "k.u.k. Luftfahrtruppen" and 1x in blue color with additional-printing on address-side "Luftschiffpost/ Zpráva balónová", issued Theyer & Hardtmuth Wien, both with instructions; blue preserved, creme with spots and short corner, rare occurrence U:A5