Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1078:
1935 (June 30), Anti-War Propaganda, 5k-35k, complete set of five used on registered cover from Bulgarian Embassy in Moscow to Sofia (private correspondence), appropriate labels, backstamped with Sofia ”06.11.35” ds, VF and very rare franking, Est. $800-$1,000, Scott #546-50
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