Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 868:
1980, 25th Anniversary of UN Membership, 40f-6fo, complete set of six Goznak sunken die proofs in black color only, approximate size 100x120mm, five proofs with printer’s marking at sides, official signatures and seals, printed on stamp gummed paper, traces of previous hinges, mostly VF and extremely rare, Est. #2,500-$3,000, Sc. # 2669-74
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