The product is a US Special Delivery stamp from the 1920s, graded as Mint Never Hinged with original gum in Very Fine condition. It is from the United States and is uncertified. Special Delivery stamps are collectible items that were used to expedite delivery of mail within the United States, particularly for high-priority items that required quick transport. This particular stamp is a prized piece for collectors of US back-of-book stamps, especially those interested in the history and evolution of postal services in the early 20th century.