British merchant ship Tintern Abbey visited the Black Sea according to a letter of the German naval attaché at Istanbul dated 20 January 1940

In his letter dated Istanbul, 20 January 1940 No. 650 g1. reported the German naval attaché to the Oberkommando der Wehrmacht Abteilung Ausland on 15 January 1940 the British merchant ship Tintern Abbey passing armed with 1 gun and 1 flak on the stern.

Source

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