This is a souvenir sheet of four United States stamps from 1989 featuring the 20th UPU Congress issue and a futuristic mail delivery theme. The stamps have a face value of 45 cents each, totaling $1.80 for the sheet. They are in mint never hinged (MNH) quality and have not been graded or certified. The colorful stamps showcase a unique design of mail delivery in the future, making this a must-have for any stamp collector or fan of postal history. The sheet is in excellent condition and has not been modified in any way. Add this unique piece to your collection today! Thank you for looking..