Mariette-Deprez" percussion revolver, six-shot, 8 mm calibre Blued and patinated square barrel, stamped on the left side "MARIETTE BREVETE" and "J.M DEPREZ", numbered "83", with extraction rod on the right side. Open frame and barrel decorated with fillets. Checkered walnut stock with carved ebony cap. B.E. About 1850. Jean Mathieu DESPREZ, platinist in Wandre (Liege), Belgian patent of revolver in 1857, 1858, 1863 and 1876. Guillaume MARIETTE, arms manufacturer and inventor in Chératte (Liege). Exhibition of Paris in 1855. Took from 1840 to 1872, a score of patents.