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View of the Mont Ventoux Observatory, a stone building with a staircase and metal railing. Printed text at the top: '10 — MONT-VENTOUX — The Observatory (2nd view)'. On the reverse, a handwritten address to Madame Hélène Vergnes in Marseille, with a 5-centime post stamp and a Carpentras dispatch stamp from May 14, 1906.