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View of the Wachtstein, an eroded sedimentary rock formation on Mount Sainte-Odile, serving as an ancient defense for the Gauls. Printed text at the bottom: 'Mont SAINT-ODILE — The Wachtstein = the watchstone'. Reverse: handwritten text describing the structure as a defensive wall, 40c stamp from the 1931 Paris Colonial Exhibition, and address to Mademoiselle Mimi Clerc in Marseille.