Infantry staff officer's bicorne, in taupe velvet and laurel leaf embroidered braid, gilt metal girdle, gilt button on sword and helmet, tricolor cockade, leather and pink silk inner cap (restored) in a wooden box "M. D'Aboville lieutenant d'Etat Major. Constantine "*, the box bears a shipping label "Chemins de fer Algériens, PHILIPPEVILLE, CONSTANTINE expédition n°4029". Third Republic period. *Lieutenant-Colonel Henri d'Aboville, born in Malesherbes (Loiret) on March 26, 1848*, died in Crach (Morbihan) on July 1, 1941, a student at the École d'application d'État-major in 1869, lieutenant in the infantry in 1870, captain in 1872, he took part in the Algerian campaign (1871-1873). Battalion commander in 1885, he was appointed to the 4th office of the General Staff the following year. Lieutenant-colonel in 1891. On October 6, 1894 , he identified and affirmed Dreyfus's handwriting on the slip addressed to von Schwartzkoppen, the German military attaché in Paris. He was one of the witnesses examined at the second Dreyfus trial in Rennes in 1899. Attached is a Polytechnique student's bicorne in taupe velvet and black laurel-leaf embroidered braid, gilded metal girdle, gilded button with the school's coat of arms, tricolor cockade, black cloth inner cap (poor condition), made by Le Jeune de Paris, 233 rue Saint-Martin. Circa 1900. In a wooden box. Provenance: Château de Rouville.