Worldwide Air Post Stamps and Postal History, One Man Collection of Tannu Tuva, Philatelic Rarities of the World, Part 1
Lot 87:
Description
1938, Airplanes and Birds, imperforate plate proofs of 1c-$1, set of ten in pairs, each stamp with ”Proof” overprint in black, less 20c, but including two of 4c in orange (issued color) and yellow, perfect condition, full OG, NH, VF, Est. $300-$350, Scott #C4/13
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