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Black and white view of the castle of Boulogne-sur-Mer, highlighting its round stone towers and an arched bridge. Printed text at the bottom: '12 BOULOGNE-sur-MER — Le château'. Reverse: handwritten correspondence to 'Monsieur A. Condurier, Hôpital Général Militaire, Salle Desgenettes, Sersailles', with mention 'CARTE POSTALE' and a warning about foreign correspondence. 5c green French Republic stamp canceled 'S-MER 24 9'.