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Black and white view of a stone-built fortified passage with two round towers, bordered by trees and crossed by a street where pedestrians walk. On the reverse, printed text reads '90. BOULOGNE-SUR-MER. La Porte Gayolle.' and handwritten correspondence addressed to Madame and Monsieur Garton Serrand in Paris. A 12-franc postage stamp with cancellation 'BOULOGNE/SUR/MER' is present.