Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1

Worldwide Air Post Stamps and Postal History - Aden

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Start price: $100

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1954, Aerogramme 50c gray blue, printer’s plate proof in unsevered horizontal pair with 134mm gutter between and 130mm selvage at left on bluish paper, three-line instead of two-line inscription at the bottom(one reverse), and indicia is in 4mm from the border (common – about in 10mm), insignificant folds, still VF and rare item