The Danish steel five-masted barque København was the fourth largest and last ship of this rigging in the world merchant fleet. She served as a sail training ship until her unexplained disappearance.
The København ran on 24 March 1921 at the shipyard of Messrs. Ramage & Ferguson, Leith, Scotland, from the stack. The first fuselage destined for this ship had already been launched in 1915, but was confiscated by the British Admiralty during the First World War in 1918 and used as the Coalhulk Black Dragon in Gibraltar. After commissioning on October 26, 1921, the ship was used with the home port of Copenhagen as a sailing training ship to train the exclusively Danish junior officers in freight transport, usually in wheat transport, by the Danish shipping company Det Østasiatiske Kompagni between Europe, South America's East Coast, East Asia and Australia. The maiden voyage of the København took her from October 26, 1921 to November 7, 1922, to San Francisco, USA and back, making a total of ten trips, including some circumnavigations. First captain was frigate captain and technical director of the company (Danish Kommandørkaptajn og Teknisk Direktør) Baron Niels Juel-Brockdorff, followed by L. Mortensen,
H. F. Christiansen and Hans Ferdinand Andersen.