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Photograph of a steam locomotive from the series 231 D, specifically the engine 231 D 186, with a Schmidt superheater, built in Paris between 1922 and 1925. The reverse details its technical specifications: four-cylinder cylinders, a grate area of 4.25 m², total weight of 96,000 kg, and mentions the publisher H. M. F. RUMON - PARIS. The postal mark is dated around 1925.