This is a first day issue envelope (3.625" x 6.5") with four PAL Airlift Military Parcel stamps, which has been postmarked Seattle Apr. 4 1968 WA. The envelope shows a package below a globe which is being circled by a plane and a helicopter. The four stamps come from the lower left-hand corner of plate block 29763. Both the envelope and the stamp say "First Day of Issue." In excellent condition.