Cachet and purple stamp depict a statue of Marie Curie, while the red stamp depicts Curie herself.
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“First Day Cover and Polish Postage Stamps Commemorating the 100th Anniversary of the Birth of Marie Curie.” Poland, circa 1967. Witco Stamp Collection, Box 2. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/br86b366z.
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