British motor tanker Capsa visited the Black Sea according to a letter of the German naval attaché at Istanbul dated 3 February 1940

In his letter dated Istanbul, Turkey 3 February 1940 No. 712 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 motor tanker Capsa on 1 February with 11,220 ton petrol underway from Constanta, Romania towards Coryton. On the stern 1 gun and 1 flak.

Source

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