Worldwide Air Post Stamps and Postal History, One Man Collection of Tannu Tuva, Philatelic Rarities of the World, Part 2
Lot 641:
Description
1937 (March 13), registered cover to Switzerland, franked by 3k and 20k from the issue and air post stamp of 3a, tied by violet Kyzyl letter ”c” date stamp (Ustinovsky No.3.3.), Berne ”1.IV.37” arrival postmark on reverse, VF and scarce franking, Est. $400-$500, Scott #73, 81, C18
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