United Nations postage stamps: bird and world (block of four)
c. 1964
designed by O. Hamann
Switzerland postage stamps: Zürich centenarium sheet
commemorative sheet in honor of 100 years of Swiss postage stamps (1843-1943)
c. 1943
United States postage stamp: energy conservation
c. 1974
“The text of the 1974 USPS commemorative set noted, “Until the national goal of self-sufficiency in energy is realized, the message of the stamp will be valid. All Americans must cooperate to conserve all forms of energy.” Those words still ring true.” —text found via Electric Consumer