U.S. Air Mail Stamps (11¢ & 13¢) by George Vander Sluis

United States · 1971 · 11¢, 13¢

Two U.S. Air Mail stamps, 11¢ and 13¢, featuring a stylized airplane in flight. The 11¢ stamp is blue, and the 13¢ stamp is red.

Issued in 1971, these stamps likely reflect updated postal rates for airmail services in the United States, designed by George Vander Sluis.