Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2

Hungary

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Start price: $1,000

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1980, 25th Anniversary of UN Membership, 40f-4fo, set of five Goznak sunken die proofs in black color only, approximate size 100x120mm, four proofs with printer’s marking at sides, official notes, signatures and seals, printed on stamp gummed paper, traces of previous hinges, mostly VF and very rare, Est. #2,000-$2,500, Scott #2669-73