Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 896:
1936, Pioneers Helping Post, 1k-15k, complete set of six (mixed perforation) used together with two other values on registered cover from Moscow to Stockholm, Moskva-25 ”9.12.36” cancellation, no arrival marking as often, mostly VF, Est. $150-$200, Scott #583-88
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