This rare 1944 Twin Motored Transport Plane Air Mail stamp collection features six green 8 cent stamps from the United States. The stamps showcase the aviation industry during the mid-20th century and are perfect for collectors interested in the history of air travel. These stamps have been previously used and presented in ungraded condition.The cancellation type for these stamps is pen cancel, and they have not been certified. The stamp collection is an excellent addition to any stamp collection interested in aviation, transportation, or United States history.