FRANCE. ADRIAN HELMET WITH DUNAND VISOR 1918/39. Adrian model 1915 helmet with Dunand visor of the type developed in 1918 but modified in 1939, steel shell brush painted in matt dark horizon blue, decorated on the front with a brass artillery officer's full dress kepi attribute, 1st type brown leather inner cap stamped "57", original riveted leather chinstrap. Removable strip visor with fine slits. BE The visor shown here is the 1918 curved model, entirely pierced with fine slits, made from sheet metal but modified at the level of the hinges in 1939 and which prefigures the patent registered on 28 November 1939. It is therefore a prototype of the latter patent, of which at least one other example is known, but needless to say it is extremely rare.