Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 131:
1938, two air post covers to Germany and England, first one – stationery envelope 50k blue, uprated by seven stamps, including 50k, 80k and 1r of Aviation set of 1937, the last one is philatelic exchange cover franked by two stamps, including imperforate single of 1r from imperforate souvenir sheet, appropriate markings, F/VF, Est. $300-$400, Scott #C73-75, C75a
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