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

Great Britain

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Start price: $150

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1912-37, King George V, ½p green, 1p scarlet and 1½p red brown, King George VI ½p green in booklet pane of 6, each value with black overprint ”Cancelled” and large boxed puncture, full OG, NH or hinged, VF, Scott #159-61, 235b