Cachet and stamp depict a mushroom cloud from a nuclear weapons test. Cachet was created by Fleetwood and the stamp was commissioned by the United Nations Postal Administration. Postmark depicts the United Nations building.
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Fleetwood. “First Day Cover Commemorating United Nations Efforts for the Cessation of Nuclear Testing and Preservation of Humanity.” United States, 1964. Witco Stamp Collection, Box 4. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/z029p480m.
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