Düsseldorf was a German fishing trawler which was built in 1921 as Mark Brandenburg.

Raised and repaired post-war, she was renamed Turbot in 1948 and Poland in 1949.

[2] Mark Brandenburg was built as yard number 365 by J. C. Tecklenborg, Geestemünde, Germany.

Owned by the Hochseefischerei Groß,[3] her port of registry was Wesermünde.

She was allocated the fishing boat registration PG 313, and the Code Letters KRFB.

On 24 January 1930, Mark Brandenburg was renamed Fischereidirektor Lübbert.

[3] On 8 August 1940, Düsseldorf was requisitioned by the Kriegsmarine and designated as Schiff 13.

On 23 August, she struck a mine and was beached at Dieppe, Seine-Inférieure, France.