This rare and historical piece of postal history documents the first Pacific Coast Ship to Shore Air Mail Transfer on June 12, 1931. It features a 5 cent stamp with a machine cancel, commemorating the aviation topic. The cover was sent from California, United States and is ungraded and uncertified. The cover is a unique addition to any stamp or postal history collection, highlighting a significant moment in aviation and mail transfer history. Its quality is used, and the cancellation type is machine cancel. Don't miss the opportunity to own this piece of history. Signed by the captain of the S. S. City Of Los Angeles ship.