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Postcard showing the Tower of Montlhéry, an ancient fortified keep at 114 meters altitude, with a staircase of 133 steps. Printed text on the front describes the castle. Reverse: handwritten address to Madame Dubois in Colombes (Seine), 10 centime postal stamp, and cancellation stamp from Juvisy-sur-Orge dated July 2, 1916.