Philatelic First Day Cover features a Colorano "Silk” cachet. These First Day Covers, produced by Colorano, were introduced in 1971 and produced until 2016. Each color illustration is printed on satin-finish fabric fastened to the cover and surrounded by a gold embossed border. The cachet depicts a portrait of Maria Goeppert Mayer (1906-1972), a German-born American theoretical physicist and a Nobel laureate in Physics for proposing the nuclear shell model of the atomic nucleus. She was the second woman to win a Nobel Prize in physics. The envelope includes a brief printed description of Goeppert and a stamp with a stylized cartoon of energy sources.
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|Rights||Public Domain Mark 1.0|
Colorano. “First Day Cover Commemorating Maria Goeppert Mayer.” Washington (D.C.), October 20, 1977. Witco Stamp Collection, Box 3. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/inr7wyb.
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