Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1405:
1938 (March 4), Aviation Exhibition, 10k, 20k and stamp from a souvenir sheet of 1r used on registered cover from Moscow to London, blue crayon cross as typical for incoming registered correspondences, mostly VF, Est. $150-$200, Sc. # C69-70, C75a
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