Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - United States - 1989, 20th UPU Congress, Futuristic Mail Delivery, 45c multicolored, top right corner sheet margin se-tenant block of four with ZIP imprint, light blue (engraved) color omitted, full OG, NH, VF, C.v. $475, Scott #C125b