Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 10:
1989, 20th UPU Congress, Futuristic Mail Delivery, (45c) multicolored, bottom left corner sheet margin se-tenant block of four, light blue (engraved) color omitted, full OG, NH, VF, C.v. $475, Est. $150-$200, Scott #C125b
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