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

Worldwide Air Post Stamps and Postal History - Bolivia

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Start price: $75

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1930, Airplane over Landscapes of Bolivian Oriental Region, 20b-3b, set of six values with diagonal overprint ”Specimen” and security punches at bottom right, all with full OG, NH, VF, Est. $100-$150 , Sc. #C29-34