Search Results

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  Postage stamps

  First Day Cover commemorating United Nations Treaty on Non-Proliferation of Nuclear Weapons

  • 1972

  Cachet created by ArtCraft includes depictions of an Atomic Research Center. Stamp depicts a mushroom cloud from a nuclear explosion crossed out with an "x".

  • Creator Of Work ArtCraft
  • Subject Postage stamps, Postmarks, Commemorative postage stamps, United Nations, Treaties, Science on postage stamps, Nuclear nonproliferation, Nuclear energy--Research--Laboratories, Cachets (Philately), First day covers (Philately), Treaty on the Non-proliferation of Nuclear Weapons (1968 June 12)
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  Postage stamps

  First Day Cover commemorating the centenary of the Convention du Mètre (Treaty of the Meter)

  • 1975

  Cachet depicts the wavelength of krypton-86, which was formerly used to define the meter from 1960 until 1983. A meter was defined during this time as the wavelength of the 605 nm (orange) spectral line of a krypton-86…

  • Artist Mendoza, J.
  • Subject Postage stamps, France, Krypton, Postmarks, Commemorative postage stamps, Treaties, Light--Wave-length, Convention du mètre (1875), Metric system, Congresses and conventions, Cachets (Philately), First day covers (Philately), Science on postage stamps