1934 (June-July) Zeppelin Argentina Flight, reg’d cover from Zagreb with 90d total franking tied there on June 21, sent to Montevideo (final bs 28.V I.34) sent via Berlin (June 22 bs) and F’hafen (June 23 cds), very elusive and fine cover with appropriate cachets and special label prepared by the Jugoslav post (Sieger 254, € 300+) (Image)