Worldwide Air Post Stamps and Postal History - United States

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Start price: $150

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1989, 20th UPU Congress, Futuristic Mail Delivery, (45c) multicolored, bottom right corner sheet margin se-tenant block of six, containing block of four and horizontal se- tenant pair with light blue (engraved) color omitted, full OG, NH, VF, C.v. $475 for block of 4, Scott #C125b, C122-23 var

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