Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 99:
1925, The Grettir Algarsson North Pole Expedition, specimen envelope carried from London to Liverpool on dirigible, which was supposed to fly from Svalbard (Spitsbergen) to North Pole (this flight did not take place because of lack of funding), pre-printed at the bottom with text and number 66, blue flight label and downward ”Specimen” hs, mostly VF, placed on Exhibition page with description in Russian, VF
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