Up for auction is a beautiful zeppelin airmail postcard cover from Reykjavik, Iceland to Evanston Illinois, USA. Beautiful stamp and cancels. Postmarked 1931.  In excellent condition. Priced to sell. Carried by the Graf Zeppelin. Has stamp #  C 10 on the cover which has a 2014 catalog value of $175.00. Nice cover. The stamp was issued and  valid for this zeppelin flight only. Very rare cover. Nothing on the back.