The Junkers J 1 nicknamed the Blechesel (Tin Donkey or Sheet Metal Donkey) was the world's first practical all-metal aircraft. Built at a time early in World War I when aircraft structural and materials technology relied almost completely on wooden construction with woven cloth covering materials to enclose the airframe the Junkers J 1 (not to be confused with the later armoured all-metal Junkers J 4 sesquiplane accepted by the Luftstreitkräfte as the Junkers J.
Made by Junkers.