A UFO in Corsica at the beginning of the 20th century

This flying saucer was photographed at the beginning of the XXth century in Corsica, in the South-East of France. What is it about?

Légende - Photo
JPS68, Public domain, https://fr.wikipedia.org/wiki/Fichier:Berg%C3%A8res_Corse_OVNI.jpg

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