The Post Office Department signaled the first orbital flight of a United States astronaut on February 20, 1962, with the issuance of the 4-cent Project Mercury commemorative stamp, placed on sale throughout the country at the exact hour Colonel John Glenn's historic flight officially ended
The stamp features an image of the Mercury "Friendship 7" capsule circling the earth. The spacecraft is now housed at the National Air and Space Museum, Washington, DC.
The stamp is 0.84 by 1.44 inches in dimension, arranged horizontally, and issued in sheets of fifty. The color of the stamp is blue and yellow on white paper. The initial printing order of 100 million stamps was later increased to 200 million.
Postal Bulletin (March 1, 1962).