Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 184:
1931 (October 17-28), 3rd SA Round Flight stationery unsevered reply card 20(c)/25(c)+20(c)/25(c) uprated for direct flight by two Swiss stamps, bearing Friedrichshafen ”17.10.31” connection and green Flight marking, Pernambuco ”20.X.31” receiver; reply portion bearing two Brazilian adhesives, violet confirmation and Friedrichshafen ”28.10.31” arrival ds, VF and scarce, Sieger #133, Frost #127-141C, C.v. $500
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