This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
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- Blue and white tissue paper balloon. Handwritten in ink on the balloon: "Ballon prepare par l'administration des postes pour le transport des lettres en 1870-71 pour le cas de siege d'une ville fortifieé."
- Documentation that came with the balloon states that it was used to send messages during the siege of Paris in the Franco Prussian War, 1870-1871. However, the balloon lacks signs of use (scorching, dirt, etc.) and this type of balloon does not achieve the altitudes that would have been necessary for delivering messages out of Paris.