Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1

Worldwide Air Post Stamps and Postal History - Yugoslavia

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Start price: $75

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1933 (August 21), First Flight Ljubljana – Zagreb cover and postcard, franked by King Alexander adhesives, blue confirmation marking and text ”Opening Ljubljana Airport – 20.VIII.33”, appropriate air mail labels, VF, Est. $100-$150 , Sc. #64-65, 66-67