The Department issued this 3-cent stamp, the second of three stamps to emphasize the importance of Wildlife Conservation in America, through the Gunnison, Colorado, post office on June 22, 1956, the occasion of the annual convention of the Colorado division of the Izaak Walton League.
The pronghorn antelope, the subject of this issue, is an outstanding example of the conservation efforts carried on by Federal and State Governments at the time of the stamp's release. Antelopes have been protected, studied, and transplanted under scientific guidance so that their number has increased from a low of 17,000 to herds large enough to allow hunting in five western states during the 1950s.
The stamp's central design features a buck and two does of the pronghorn antelope species in their natural habitat. Across the top of the stamp is the wording "Wildlife Conservation," in dark modified architectural Roman, and across the bottom "3c United States Postage 3c," in modified whiteface architectural Roman. The wording "Pronghorn Antelope," arranged in two lines, appears to the left of the design slightly below the center, in dark Gothic. Bob Hines, an artist for the Fish and Wildlife Service and the US Department of the Interior, provided the design from an drawing.
The stamp was printed by the rotary process, electric-eye perforated, and issued in panes of fifty stamps each. The printing of 120 million stamps was authorized.
Postal Bulletin (May 29, 1956)