Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 800:
1977, The Third World Youth Conference, 10ch, 15ch and 25ch, unissued complete set of three, all with top left corner margins, full OG, NH,, VF, C.v. $3,500 for set and souvenir sheet containing these three stamps, Est. $400- $500, Scott #1600 fn
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