Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 92:
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 (not issued as such), but including two of 4c in orange (issued color) and yellow, perfect condition, full OG, NH, VF and rare, Est. $400-$500, Scott #C4/13
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