Zeppelin Flights. 1931 (June 30-July 4), Iceland Return Flight registered postcard, franked by ''Zeppelin 1931'' overprints on 30a and 1k values, tied by Reykjavik ds, green confirmation cachet and Friedrichshafen ''3.7.31'' receiver, VF, Sieger #114B, C.v. €265 (Image)