Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 603:
1950, International Philatelic Exhibition, 10+10c-5+5p, complete set of six imperforated trial color proofs, blocks of four, printed on thick wove paper, no gum as issued, NH, VF, Est. $200-$250, Scott #B12, CB1-5
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