Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3

Russian Air Post Stamps

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Start price: $100

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1955, North Pole to Moscow Flight, strongly shifted to the left red overprint on 2r black and yellow green, horizontal pair with perforation L12½ instead of comb 12×12½, full OG, NH, VF, Est. $150-$200 , Sc. #C96 var