Bidspirit auction | United States - Air Post

United States - Air Post stamps - 1989, Futuristic Mail Delivery, 20th UPU Congress, (45c) multicolored, bottom left corner sheet margin ZIP se- tenant block of four with light blue (engraved) color omitted (country name and denomination), full OG, NH, VF, C.v. $500, Sc. #C125b