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Black and white view of the Toupain viaduct in Saint-Brieuc, composed of 7 arches, with a length of 34 meters and a height of 59 meters, crossing a hilly landscape. On the reverse, a handwritten letter dated August 22, 1924, addressed to Madame Léonie Valentin in Angers, with a 10-centime postage stamp and a Saint-Brieuc cancellation.