Auction 90, Session 1 - Worldwide Rare Stamps and Postal History

United States - Air Post stamps

The auction will start in __ days and __ hours

Start price: $150

Buyer's premium:

1989, 20th UPU Congress, Futuristic Mail Delivery, (45c) multicolored, bottom sheet margin (USPS) se-tenant block of four with light blue (engraved) color omitted (country name and denomination), full OG, NH, VF, C.v. $500, Est. $200-$250, Sc. #C125b