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.

On 12 April 1937, her fishing boat registration was changed to PC 177.

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