British tanker Cowrie visited the Black Sea according to a letter of the German naval attaché at Istanbul dated 12 February 1940

In his letter dated Istanbul, Turkey 12 February 1940 No. 729 g. reported the German naval attaché to the Oberkommando der Wehrmacht Abteilung Ausland the neutral ships passing Istanbul coming out of the Black Sea and loaded with contraband for or chartered by the enemy. An item reported the British tanker Cowrie on 7 February coming from Constanta, Romania loaded with 11,790 ton (7,540 ton fuel oil and 4,250 ton gas oil?) underway towards Gibraltar for orders. Reported passing FT on 9 February 1940.

Source

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