This stamp shows a heart on a wax seal closing an envelope.
Organizations and Industries
This 10c airmail stamp commemorates the 50th anniversary of air mail service in the U.S.
This 15c airmail stamp honors Postmaster General Montgomery Blair and the 100th anniversary of the first International Postal Conference held in Paris. This conference was the forerunner of the Universal Postal Union (UPU).
This stamp promotes volunteerism.
This stamp commemorates both science and industry.