This US FDC First Day of Issue Cover commemorates the 100th anniversary of the US Air Mail Service in 1968. The cover features a block of multi-color vintage stamps with a cancellation type of First Day of Issue. It is an ungraded, used item with a topic of Ephemera and was manufactured in the United States. This item is perfect for collectors of US stamp covers and those interested in the history of the US Air Mail Service.  Block of 4 stamps