Auction # 2506 WORLDWIDE + ARGENTINA: Special auction Punta del Este Exposition

17/OC/1931 Freidrichshafen - Argentina, cover franked with 4Mk. (Sc.C35 x2 + C36) and carried on the third Zeppelin flight to South America, on back there is an interesting receiving mark of Buenos Aires applied on 22/OC, with slogan cancel "Tercer viaje experimental - Condor-Zeppelin", rare applied like arrival mark, excellent quality!