Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Brazil - Dornier ''Do-X'' Flights - 1931 (August 4), mixed franking postcard from Rio de Janeiro to Havana, Cuba, franked by five stamps, tied by Rio date stamps, black rhombus flight marking, Antilla and Havana arrival handstamps on reverse, VF and scarce, Est. $250-$300 , Scott #C8, C18 x2, C20