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Digital Collections

Postage stamps

Postage stamp commemorating Ghana's conversion to the metric system in 1975

  • 1975

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Stamp depicts scales weighing jars of jam, with text, "2 1/4 lbs of Jam is a little more than a kilogram."

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  • Courtesy of Science History Institute

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Physical container
  • Box 1

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Cite as

“Postage Stamp Commemorating Ghana's Conversion to the Metric System in 1975.” Ghana, 1975. Witco Stamp Collection, Box 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/4m90dv54v.

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The Science History Institute recognizes there are materials in our collections that may be offensive or harmful, containing racist, sexist, Eurocentric, ableist, or homophobic language or depictions. The history of science is not exempt from beliefs or practices harmful to traditionally marginalized groups. The Institute is engaged in ongoing efforts to responsibly present and address the evidence of oppression and injustice inextricable from the history of science. If you would like to learn more about our ongoing efforts or if you encounter harmful, inaccurate, or insufficient descriptions, please contact us at digital@sciencehistory.org.