Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1995:
2007, International Polar Year, imperforate proof of souvenir sheet of 6r, 7r and 8r in issued colors, printed on chromaline card with control lines at right and printer’s markings on margins, fresh, VF and rare, Est. $600-$800, Scott #7021
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