This US First Day of Issue cover commemorates the 100th anniversary of the Smithsonian Institution in 1946. The cover features a multi-colored design and bears a first day of issue cancellation. It is a vintage item that has been previously used and remains ungraded. The cover is a great addition to any collection of ephemera and stamps. It is an ideal item for collectors of US stamp covers and those interested in the history of the Smithsonian Institution. This item is being sold as uncertified and is free from any California Prop 65 warnings.