Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1

United States - Air Post stamps

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Start price: $100

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1967, Alaska Purchase, 8c brown, block of four with two pre-printing paper folds and shift of vertical perforation, as well as horizontal strip of eight representing bottom part of pane with horizontal perforation shifted to the design, full OG, NH, VF, Est. $150-$200, Sc. #C70 var