British tanker Corbis bound for Avonmouth, England according to a letter of the German naval attaché at Istanbul dated 30 December 1939

In his letter dated Istanbul, Turkey 30 December 1959 B No. 596g. reported the German naval attaché to the Oberkommando der Wehrmacht Abteilung Ausland the ships passing the Dardanelles coming from Romania and loaded with contraband for the enemy. An item mentioned on 24 December the British tanker Corbis loaded with 10,800 ton gasoline bound for Avonmouth, England. Armed with 1 gun and 1 flak at the stern.

Source

Bundesarchiv. German Marineattaché for Turkey, Greece, Romania and Bulgaria 1939-1941. RM 12-II/459.