Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1

Worldwide Air Post Stamps and Postal History - United States

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Start price: $400

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1951, DC-4 Skymaster, inverted ”REVALUED 6c P.O. DEPT.” on stationery envelope 5c red, very fresh, unused and VF. This error is listed but priced with ”-” in the Cat., Est. $800-$1,000, Scott #UC19a