This set of four attached postal cards features the 1989 World Stamp Expo design from the United States. The cards are in great shape and showcase the first day issue stamp design. They were originally released in Baltimore, Philadelphia, Washington DC, and New York, making them a unique addition to any stamp collection. The cards are categorized as stamps, United States, covers, and postal history, and are perfect for collectors interested in the topic of first day issue stamped cards.