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View of the Temple of Mercury and the Observatory of Puy-de-Dôme, with a sign indicating 'HISTORIC MONUMENTS' and an altitude of 1463 m. In the foreground, visitors are sitting on stone blocks. The reverse side features a handwritten letter addressed to Mr. Julien Genge in Viroflay, with a 10-centime postage stamp and postmarks from Clermont-Ferrand and Viroflay dated July 16 and 25, 1907.