Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 966:
1958, imperforate proofs of 5c x3, and 10c, 15c x3 in issued colors without flags, top left corner sheet margin blocks of four, full OG, NH, VF, Est. $300-$400, Scott #368-70, C114-17
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