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View of the Hôtel de Ville in Boulogne-sur-Mer with its imposing bell tower, under a cloudy sky. In the foreground, two people and a dog cross the square. The reverse features a handwritten letter to Madame Marguerite in Bourgoin, dated 17 September 1917, with a 10-centime postage stamp and a postmark from Wimereux (Pas-de-Calais).