Cachet depicts a bust of Avogadro as well as text of Avogadro's law, which states that equal volumes of gases under the same conditions of temperature and pressure will contain equal numbers of molecules. The stamp depicts a portrait of Avogadro, his signature, and text of Avogadro's law.
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“First Day Cover Commemorating the Centenary of the Death of Amedeo Avogadro.” Italy, 1956. Witco Stamp Collection, Box 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/s1784k78s.
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