Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1013:
1934, ”Portugal”, ½a-20a, set of ten imperforate plate proofs in horizontal pairs, printed on paper with watermark ”Maltese Cross”, no gum as produced, NH, VF and rare, Est. $1,000-$1,200, Scott #268/81
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