The Byrd Antarctic Expedition II stamp received immediate endorsement from the Post Office Department when an approved model and three die proofs were sent on September 22, 1933, from the Bureau of Engraving and Printing. This 3-cent vertical stamp, the same size and shape as a Special Delivery stamp, was intended for the collectors' market alone. The Post Office Department arranged for 'philatelic mail' bearing this stamp to be carried by the expedition and postmarked at the Little America post office at the expedition's base camp for a fee of fifty-three cents.

• mint; perf 11
• October 9, 1933
• paper; ink (dark blue); adhesive / engraving
• United States of America