cover Liechtenstein, 1931, 1fr, 2fr Zeppelins (C7, C8), tied on separate Zeppelin flight card (postal card) or cover, also incl. 1932 Zeppelin flight card with block of four of no. C2 and single no. 97 (picture post card of a Zeppelin in flight over a city), fresh, very fine, Scott retail $375.00+