Worldwide Air Post Stamps and Postal History, One Man Collection of Tannu Tuva, Philatelic Rarities of the World, Part 1
Lot 513:
Description
1949, 75th Anniversary of the UPU, four imperforate trial color proofs in various color combinations, all are corner sheet margin examples, full OG, NH, VF, Est. $200-$250 , Scott #26-29
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