British merchant ship Kavak 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 that the British merchant ship Kavak of the Moss Huchinson Lines, Liverpool, England sighted on 6 February was armed with 2 guns behind each other on the same level mounted. She was complete grey painted. She unloaded stores for the Steel plant Karabük and had also cargo for Haidarpapa for the Turkish army including a large amount of gasmasks (50 boxes), 15 medium tanks and 4 Flak search lights.

Source

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